It is hard to know what the problem here is without seeing how you have things set up and what your data looks like.
Make sure the text variable you want to use is set to Role of "Text" and not "Text Location". Make sure your text variable has several terms of text in it for most rows and not just a single term for each row.
If you still have problems, try the sampsio.abstract data set that ships with the product. Does that work for you? Also, see the examples in the Text Miner help.
... View more