Open WordNet problem

Is it a limitation of your system memory?
I think @mschmitz is the original creator of the Wordnet extension, so he may have some additional ideas.

I have used WordNet extension several times without any major problems. I do not think "too many files" is a likely error from the WordNet. How do you prepare your text data? If it is in the form of examples with a text field then you will have no issues. If you are collecting your text from the directory looping over it using Loop Files, perhaps you try to open all concurrently and running out of memory, in which case try disabling parallel execution of the Loop Files. If you use Process Documents from Files and it gets stuck, try preparing your documents before hand into an example set first and then use Process Documents from Data, in which case you'd separate the concerns of data collection vs text processing, at least you'd know which one fails.