Hi I build a small program before converting it into Sub-Vi.I have a problem which i can't solve. That's because I am unable to use highlight execution to troubleshoot. When I start the program with the highlight execution on. It stopped abrupty popping up a message " Error 1 occurred at release Queue in my file, Possible reasson: An input parameter is invalid" So what could have gone wrong? How do I troubleshoot it?So here's my program, read-table.viAnd there's another thing about multicolumn listbox put inside main vi.But I need to create a subvi (my current read_table.vi) that receives the input and output to multicolumn listbox in main.vi. I would like to program such that the sub-vi will process data and input to main.vi thru multicolumn listbox in REAL TIME, NOT after the subvi has finished before putting all data to main vi. Is there a way? The read_table.vi will be without multicolumn listbox once it works, so how do i write the data to multicolumn in main.vi from read_table.vi. Should I use control reference?Clement

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Great!

Thank you

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