Debug Expression could not be evaluated

In Debug when i select a variable to Add to Watch i get the messages Expression could not be Evaluated.

How can i solve this?

Something inside the expression could not be determined properly by terminal. Please give steps to reproduce as to see it is a bug or not.
drazen64:

See this answer:  https://www.mql5.com/en/forum/151874

 



it works thank you.