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You can check to see if the script is working by starting it via the advisor and opening the console, there you press CURSOR_UP, if it says something about season:... the script is up and running.
Normally this kind of error happens if the script is activated during Ai turns, after a turn without activation or due to a bugged installation.
Please run validateInstall.bat found in your main RTW folder an post your results here.
XSamatan
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