Problem ,selectwindow tab=open

SOMETIMES , TAB=OPEN WORKS WELL BUT SOMETIMES ALSO SCRIP STOPS IN THE MIDDLE OF THE ROAD, TAB IS ALREADY OPEN BUT TAB=OPEN WILL NOT RUN AGAIN TO THE NEXT STEP WHICH RESULTS:
[error]
Line 47: Could not establish connection. Receiving end does not exist.

MY VALUE FILL WITH VARIABLES

BUT THANKS FOR READING MY COMMENT, THIS EXTENSION HELPED ME SO MUCH, I DON’T KNOW IF THIS IS MY PC’S WRONG OR A UI VISION BUG

THANK YOU