SubVI runs in highlight execution mode or on it's own but crashes with unknown error if run in main code

Hi Everyone,

I'm trying to gather data from an excel file using a Vlookup type code (Please post one if there already is one, I have looked in the forum but not seen one)

When I run the main program "search excel.vi" the 2nd subvi doesn't run. However it does run when I either have the subvi in highlight execution or if I just run the subVI.

Any help appreciated. I have attached all VIs and excel sheet