python rand generator memory error

I am getting the following error when I am running my python script:

  File "mtrand.pyx", line 1347, in mtrand.RandomState.rand (numpy/random/mtrand/mtrand.c:19701)
  File "mtrand.pyx", line 856, in mtrand.RandomState.random_sample (numpy/random/mtrand/mtrand.c:15527)
  File "mtrand.pyx", line 167, in mtrand.cont0_array (numpy/random/mtrand/mtrand.c:6127)
MemoryError

here is the exact line on which this error pops up: http://ift.tt/2oHMCnN when my script comes to this line, i get the above error.

could somebody tell me where the problem lies? what should I do?