Checkbox Broken and Client VERY frustrated

I have a very simple parameter in Looker Studio named Total?. I defaulted the value to True.

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When I put a Checkbox for the parameter on the report, it is telling me that there is a Configuration issue.

I have done it the same way on many other reports, but it isn’t working on this one. I can change it to be a dropdown and have String values, but my clients DOES NOT want that.

Thanks in advance.