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The third function on your block diagram is wrong. Oops, sorry, I can't help you find the error in your code without seeing your code. When you post code, do not send a picture of your code -- attach the VI itself (or a ZIP file with the VI and related files, including the Project file) so we can (a) see it and (b) test it.
Hmmm, I don't even see a picture... If you are seeing a stack overflow, that is a VERY liw level error. Where are you getting the data? What external code are you calling?
Mike.
Certified Professional Instructor Certified LabVIEW Architect LabVIEW Champion