Apparently it's something to do with
memory size (comments, 2nd page) -- try switching to 64bit?
I'm using a 32bit computer and I get the same error message every once in a while, especially with double threshold. Generally, I've found that if I delete the module and then re-add it the error message goes away, although I haven't figured out what triggers the error. I'm getting a 64bit computer soon, so maybe that will solve the problem.