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I ran into this just the other day. The error means that you are passing a null string as one of the function arguments. The "Assertion 'contains(I)' failed" part of the message indicates that the string wasn't there. If you run this in the debugger, when you hit that line, an abort message should pop up. Choose retry to stop the program. Then use the call stack to backtrack where this was called from. Then check all the arguments passed to the function.

I ran into this just the other day. The error means that you are passing a null string as one of the function arguments. The "Assertion 'contains(I)' failed" part of the message indicates that the string wasn't there. If you can run this in the a debugger, when you hit that line, an abort message should pop up. Choose retry to stop the program. Then use the call stack to backtrack where this was called from. Then check all the arguments passed to the function.