Getting disk i/o python error after few seconds

Exception in thread Thread-1:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 754, in run
self.__target(*self.__args, **self.__kwargs)
File "/usr/local/lib/python2.7/dist-packages/awsshell/makeindex.py", line 88, in write_doc_index
do_write_doc_index(db, help_command, close_db_on_finish=should_close)
File "/usr/local/lib/python2.7/dist-packages/awsshell/makeindex.py", line 93, in do_write_doc_index
_index_docs(db, help_command)
File "/usr/local/lib/python2.7/dist-packages/awsshell/makeindex.py", line 111, in _index_docs
_index_docs(db, sub_help_command)
File "/usr/local/lib/python2.7/dist-packages/awsshell/makeindex.py", line 110, in _index_docs
db[dotted_name] = text_docs
File "/usr/local/lib/python2.7/dist-packages/awsshell/db.py", line 43, in __setitem__
{'key': key, 'value': value})
OperationalError: disk I/O error