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