ImportError: No module named copy_reg pickle

I'm trying to unpickle an object stored as a blob in a MySQL database. I've manually generated and stored the pickled object in the database, but when I try to unpickle the object, I get the following rather cryptic exception:

ImportError: No module named copy_reg

Any ideas as to why this happens?

Method of Reproduction

Note: Must do step 1 on a Windows PC and steps 3 and 4 on a Linux PC.

1) On a Windows PC:

file = open("test.txt", "w")
thing = {'a': 1, 'b':2}
cPickle.dump(thing, file)

2) Manually insert contents of text.txt into blob field of MySQL database running on linux

3) In Python running on a linux machine, fetch the contents of column from MySQL

4) Assuming that you put the contents of the blob column into a variable called data, try this:

cPickle.loads(rawString)