Paginated reports: getting error that parameter not declared though I properly declared it

Solved. In the dataset properties ---> parameters, I typed the parameter name as Anonymous_date and the value as [@to_date]. (This was what Chat GPT told me, unfortunately. :)). Today I luckily saw a web with a screenshot of this property and basedon that, I corrected the name to simply to_date (without the @ sign), and the value kept as before as  [@to_date]. This worked.