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Posted by Nick Thissen

on 06/20/2019 15:07:40

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The script is compiled when you save the theme (or when something triggers an automatic backup).

During compilation a new script instance is created. This calls your script constructor code.

In that code an exception is thrown and the issue is this:
System.ArgumentException: Append access can be requested only in write-only mode.

This error is being handled and logged, ATVO should not be crashing but merely showing that the error happened.