Looks like you're trying to predict what's in your next shopping cart ;-) But it may not be the right time to make a joke...
I assume the cause of the exception is :
Caused by: java.lang.NegativeArraySizeException
Somehow StackNet and more specifically fsmatrix initialization fails at line 85
this.data=new double [rows*columns];
So StackNet ends up with negative values for either rows or columns eventhough it successfully reads your files...
Just for the record is there anything wrong in paramsv1.txt like negative values ? A last question what version of stacknet do you use? The stack trace does not seem in line with the latest master branch. Goldentom.