Hello, this is a result to any issue in the PLC program. In your screenshot it's not visible, the many errors in message window and the exception also not. Suggest to check your code for string related issues (it's pointing to concat), check array, structure and pointer as well. We provide check functions, they can be added via context menu of "Application" -> "Inserting templates..." add the CheckFunctions When you cannot solve it, some more info of your errors will be helpful.
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