Malformed parameter : templateValues Error

Hi there, 

I am looking to duplicate a report that I created and just edit the data source (sql query).

This worked fine but some of the charts are now giving me an error.

It shows Malformed parameter : templateValues and it does not render any graph.

Ive looked all over but cant find a fix for this. I used Chatgpt and it said this: The “Malformed parameter : templateValues” pop‑up is thrown by the BigQuery/SQL connector before it even sends your query to the warehouse.
Looker Studio stores every custom query, calculated field and report‑level control in a JSON object.
If that object contains a parameter definition that can’t be parsed (for example a missing value, an un‑escaped quote, or a reference to a parameter that doesn’t exist in the data source you’re pointing at) the whole data source is marked as un‑connectable and every chart based on it shows the Data Set Configuration Error dialog.  

But nothing it suggested actually worked. Is there any feedback that anyone has? 

 Screenshot 2025-05-09 at 12.48.29.png

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