Hello alishirvani;

CALL is part of the STL instructions. So we could deduce the function causing you problems in your uploaded project was written in STL. Is this correct?

In that case, the following discussion should be able to help you, also Jacek's link in that thread.

https://support.industry.siemens.com/forum/ca/en/posts/what-is-problem-in-logic-/273242/?page=0&pageSize=10

If this dies not apply to your situation  please provide more complete information on your problem, with screenshots of the code with red CALLs, and any error message associated.

Hope this helps, 

Daniel Chartier

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