errors Pansharpen landsat 8

Dear all,
I am pansharpening but I got error as the below. Please tell me how to fix it.
I can't pansharpen :(.

root@osgeolive:/home/user# landsat process /root/landsat/downloads/LC81260452014284LGN00 --pansharpen===> PanSharpened Image processing started for bands 4-3-2-8
===> Getting boundaries
===> Rescaling
band 4
Time spent : 103.93 seconds
Traceback (most recent call last):
File "/usr/local/bin/landsat", line 8, in
landsat.landsat.**main**()
File "/usr/local/lib/python2.7/dist-packages/landsat/landsat.py", line 491, in **main**
exit(_main(args))
File "/usr/local/lib/python2.7/dist-packages/landsat/landsat.py", line 306, in main
args.ndvigrey, bounds)
File "/usr/local/lib/python2.7/dist-packages/landsat/landsat.py", line 479, in process_image
return p.run()
File "/usr/local/lib/python2.7/dist-packages/landsat/decorators.py", line 11, in wrapped_f
return func(_args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/landsat/image.py", line 456, in run
bands[:3] = self._rescale(bands[:3])
File "/usr/local/lib/python2.7/dist-packages/landsat/image.py", line 526, in _rescale
bands[key] = sktransform.rescale(band, 2)
File "/usr/local/lib/python2.7/dist-packages/skimage/transform/_warps.py", line 188, in rescale
clip=clip, preserve_range=preserve_range)
File "/usr/local/lib/python2.7/dist-packages/skimage/transform/_warps.py", line 119, in resize
preserve_range=preserve_range)
File "/usr/local/lib/python2.7/dist-packages/skimage/transform/_geometric.py", line 1343, in warp
order=order, mode=mode, cval=cval)
File "skimage/transform/_warps_cy.pyx", line 106, in skimage.transform._warps_cy._warp_fast (skimage/transform/_warps_cy.c:2530)
MemoryError
root@osgeolive:/home/user#