mlab related tests fail

after installing mayavi using pip in python 2.7 environment the followng four test failed.
1.test_mlab.py
2.test_mlab_savefig.py
3.test_mlab_show.py
4.test_mlab_envisage.py
Pyside version 1.2.4

test_mlab.py
```

Exception occurred in traits notification handler.
Please check the log file for details.
Exception occurred in traits notification handler for object: , trait: delay, old value: 500, new value: 10
Traceback (most recent call last):
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traits/trait_notifiers.py", line 394, in __call__
self.handler(*args)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/mayavi/tools/animator.py", line 121, in _delay_changed
if t.IsRunning():
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/pyface/timer/timer.py", line 68, in IsRunning
return self.is_running
AttributeError: 'Timer' object has no attribute 'is_running'
ERROR|2019-05-28 15:24:54,923|Exception occurred in traits notification handler for object: , trait: delay, old value: 500, new value: 10
Traceback (most recent call last):
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traits/trait_notifiers.py", line 394, in __call__
self.handler(*args)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/mayavi/tools/animator.py", line 121, in _delay_changed
if t.IsRunning():
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/pyface/timer/timer.py", line 68, in IsRunning
return self.is_running
AttributeError: 'Timer' object has no attribute 'is_running'

failures=1
Exception
In /localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/pyface/timer/timer.py:68
AttributeError: 'Timer' object has no attribute 'is_running' (in IsRunning)
ERROR|2019-05-28 15:24:54,925|Exception
In /localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/pyface/timer/timer.py:68
AttributeError: 'Timer' object has no attribute 'is_running' (in IsRunning)
Traceback (most recent call last):
File "/localhome/administrator/mayavi/integrationtests/mayavi/common.py", line 549, in run
self.do()
File "test_mlab.py", line 77, in do
run_mlab_examples()
File "test_mlab.py", line 50, in run_mlab_examples
while is_timer_running(obj.timer):
File "test_mlab.py", line 25, in is_timer_running
return timer.IsRunning()
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/pyface/timer/timer.py", line 68, in IsRunning
return self.is_running
AttributeError: 'Timer' object has no attribute 'is_running'
```

test_mlab_savefig.py
```

.E
======================================================================
ERROR: test_mlab_screenshot (__main__.TestMlabSavefigUnitTest)
----------------------------------------------------------------------
Traceback (most recent call last):
File "test_mlab_savefig.py", line 95, in test_mlab_screenshot
data = screenshot(mode='rgb', antialiased=aa)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/mayavi/tools/figure.py", line 352, in screenshot
out.shape = shape
ValueError: cannot reshape array of size 12 into shape (0,0,3)

----------------------------------------------------------------------
Ran 2 tests in 2.379s

FAILED (errors=1)
```

test_mlab_show.py

```
Exception occurred in traits notification handler.
Please check the log file for details.
Exception occurred in traits notification handler for object: , trait: delay, old value: 500, new value: 10
Traceback (most recent call last):
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traits/trait_notifiers.py", line 394, in __call__
self.handler(*args)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/mayavi/tools/animator.py", line 121, in _delay_changed
if t.IsRunning():
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/pyface/timer/timer.py", line 68, in IsRunning
return self.is_running
AttributeError: 'Timer' object has no attribute 'is_running'
Traceback (most recent call last):
File "test_mlab_show.py", line 32, in
test_mlab_show()
File "test_mlab_show.py", line 17, in test_mlab_show
run_mlab_examples()
File "/localhome/administrator/mayavi/integrationtests/mayavi/test_mlab.py", line 50, in run_mlab_examples
while is_timer_running(obj.timer):
File "/localhome/administrator/mayavi/integrationtests/mayavi/test_mlab.py", line 25, in is_timer_running
return timer.IsRunning()
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/pyface/timer/timer.py", line 68, in IsRunning
return self.is_running
AttributeError: 'Timer' object has no attribute 'is_running'
Exception TypeError: "'NoneType' object is not callable" in at 0x7f40148247d0> ignored
X Error of failed request: BadWindow (invalid Window parameter)
Major opcode of failed request: 10 (X_UnmapWindow)
Resource id in failed request: 0x2800018
Serial number of failed request: 68
Current serial number in output stream: 70
```

test_mlab_envisage.py

```
Exception occurred in traits notification handler for object: , trait: children_ui_list, old value: scenes_items, new value: []
Traceback (most recent call last):
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traits/trait_notifiers.py", line 591, in _dispatch_change_event
self.dispatch(handler, *args)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traits/trait_notifiers.py", line 695, in dispatch
handler(*args)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 1530, in _children_replaced
self._append_node(nid, child_node, child)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 415, in _append_node
return self._insert_node(nid, None, node, object)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 432, in _insert_node
self._add_listeners(node, object)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 634, in _add_listeners
node.when_label_changed(object, self._label_updated, False)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/tree_node.py", line 1516, in when_label_changed
return object.tno_when_label_changed(self, listener, remove)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/tree_node.py", line 1898, in tno_when_label_changed
self._listener_cache[memo] = wrapped_listener
AttributeError: 'Scene' object has no attribute '_listener_cache'
ERROR|2019-05-28 15:27:03,572|Exception occurred in traits notification handler for object: , trait: children_ui_list, old value: scenes_items, new value: []
Traceback (most recent call last):
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traits/trait_notifiers.py", line 591, in _dispatch_change_event
self.dispatch(handler, *args)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traits/trait_notifiers.py", line 695, in dispatch
handler(*args)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 1530, in _children_replaced
self._append_node(nid, child_node, child)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 415, in _append_node
return self._insert_node(nid, None, node, object)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 432, in _insert_node
self._add_listeners(node, object)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 634, in _add_listeners
node.when_label_changed(object, self._label_updated, False)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/tree_node.py", line 1516, in when_label_changed
return object.tno_when_label_changed(self, listener, remove)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/tree_node.py", line 1898, in tno_when_label_changed
self._listener_cache[memo] = wrapped_listener
AttributeError: 'Scene' object has no attribute '_listener_cache'
Traceback (most recent call last):
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 962, in _on_item_expanded
self._expand_node(nid)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 515, in _expand_node
self._append_node(nid, child_node, child)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 415, in _append_node
return self._insert_node(nid, None, node, object)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 432, in _insert_node
self._add_listeners(node, object)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 634, in _add_listeners
node.when_label_changed(object, self._label_updated, False)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/tree_node.py", line 1516, in when_label_changed
return object.tno_when_label_changed(self, listener, remove)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/tree_node.py", line 1898, in tno_when_label_changed
self._listener_cache[memo] = wrapped_listener
AttributeError: 'ArraySource' object has no attribute '_listener_cache'
Traceback (most recent call last):
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 962, in _on_item_expanded
self._expand_node(nid)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 515, in _expand_node
self._append_node(nid, child_node, child)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 415, in _append_node
return self._insert_node(nid, None, node, object)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 432, in _insert_node
self._add_listeners(node, object)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 634, in _add_listeners
node.when_label_changed(object, self._label_updated, False)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/tree_node.py", line 1516, in when_label_changed
return object.tno_when_label_changed(self, listener, remove)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/tree_node.py", line 1898, in tno_when_label_changed
self._listener_cache[memo] = wrapped_listener
AttributeError: 'ModuleManager' object has no attribute '_listener_cache'
Traceback (most recent call last):
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 962, in _on_item_expanded
self._expand_node(nid)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 515, in _expand_node
self._append_node(nid, child_node, child)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 415, in _append_node
return self._insert_node(nid, None, node, object)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 432, in _insert_node
self._add_listeners(node, object)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 634, in _add_listeners
node.when_label_changed(object, self._label_updated, False)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/tree_node.py", line 1516, in when_label_changed
return object.tno_when_label_changed(self, listener, remove)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/tree_node.py", line 1898, in tno_when_label_changed
self._listener_cache[memo] = wrapped_listener
AttributeError: 'IsoSurface' object has no attribute '_listener_cache'
Traceback (most recent call last):
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/pyface/ui/qt4/gui.py", line 200, in _dispatch
self._callable(*self._args, **self._kw)
File "test_mlab_envisage.py", line 9, in close
e.window.close()
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/pyface/workbench/workbench_window.py", line 180, in close
self.destroy_views(self.views)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/pyface/workbench/workbench_window.py", line 339, in destroy_views
view.destroy_control()
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/pyface/workbench/traits_ui_view.py", line 72, in destroy_control
self.ui.dispose()
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/ui.py", line 256, in dispose
self.finish()
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/ui.py", line 283, in finish
self.reset(destroy=False)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/ui.py", line 325, in reset
editor.dispose()
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 260, in dispose
self._delete_node(self._tree.invisibleRootItem())
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 457, in _delete_node
self._delete_node(cnid)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 457, in _delete_node
self._delete_node(cnid)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 457, in _delete_node
self._delete_node(cnid)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 457, in _delete_node
self._delete_node(cnid)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 481, in _delete_node
self._remove_listeners(node, object)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/qt4/tree_editor.py", line 650, in _remove_listeners
node.when_label_changed(object, self._label_updated, True)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/tree_node.py", line 1516, in when_label_changed
return object.tno_when_label_changed(self, listener, remove)
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/traitsui/tree_node.py", line 1900, in tno_when_label_changed
wrapped_listener = self._listener_cache.pop(memo, None)
AttributeError: 'IsoSurface' object has no attribute '_listener_cache'
Traceback (most recent call last):
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/pyface/ui/qt4/workbench/workbench_window_layout.py", line 618, in sizeHint
sh = self.centralWidget().sizeHint()
AttributeError: 'NoneType' object has no attribute 'sizeHint'
Traceback (most recent call last):
File "/localhome/administrator/.virtualenvs/cv/local/lib/python2.7/site-packages/pyface/ui/qt4/workbench/workbench_window_layout.py", line 618, in sizeHint
sh = self.centralWidget().sizeHint()
AttributeError: 'NoneType' object has no attribute 'sizeHint'
```

Any idea what could be the underlying issue?