This is  a pretty basic idea and one you likely have tried. 

 

I dont know how large your stored proc is, but you might try commenting out the individual variables (if any) and related datafields then add them back at one at a time until you find the offending problem or get a more descriptive error message.  It does seem to be in the stored proc.  If you are passing any parameters or variables to it and the data types dont convert could be a cause. Specifically data typing the parameters and variables could resolve the problem.

 

 

Regards,

 

John W.