Save Failed Modeler error: irrecoverable run-time error

Hi guys,

I am running NX 9.0.2.5. I am having this error message come up every time I try to save this particular file. It allows me to save after running part cleanup sometimes, other times the session just freezes and never comes back after the error message.
What is causing this to pop up? I went though my features and removed all of the associative measures, and unparameterized features that didn't need to be associative, like lines and project curves etc.
There is nothing associative to this file in another external file.
I also attached a picture of the error.

Thanks for the help
Rob