Report Builder functionality

I'm trying to create a report that is basically the same as the worklog report, but with a few tweaks. I'm trying to parameterize dates, for example, and am not seeing exactly how to put that into my query. I did find the regex and found that I need to use @Parameters.ParamName$ for Jira Assistant to find and replace them, but I get an error when trying to save the query.

Error fetching ticket details
Date value 'undefined' for field 'worklogDate' is invalid. Valid formats include: 'YYYY/MM/DD', 'YYYY-MM-DD', or a period format e.g. '-5d', '4w 2d'.

It looks like it's trying to run the query for the dataset immediately and fails. How can I get the query to not run until I View the report and provide parameters?

I'm on v0.97 for Chrome.

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