Measure returning error in visual

I have a measure that restricts a list based on other lists of attributes. When i restrict by list9 the measure returns an error, so i looked at how list9 is constructed, when i replace the 2 variables (upper/lower bounds) that define which items are a part of list9 with abitrary constants the error disappears. This is not a solution it just gives insight to how the problem is caused.

What i would like to know at this stage is whether anybody knows what this error means or whether there is somewhere i can read about this:
An unexpected error occured (file 'xlrellogop.cpp', line 3127, function 'XLLogOp_SPJ<class XLScaLogOp>::ExecSpool').