'Generate' Button is Greyed Out in Reports Template

There's probably a simple answer to this.

I want to run the Test Execution Results (summary) template report. But the 'generate' button at the bottom is greyed out. Is that an access issue or due to something else? We have a test environment for Zephyr Scale and I have no problems running a report there.

PLEASE IGNORE (I couldn't see a way to delete this).  A colleague has helped me. I had to change the filter on the report. Issue resolved.