I received the error message when trying to add a new series follow this guideline: https://confluence.atlassian.com/servicedeskcloud/reporting-on-slas-732528981.html#ReportingonSLAs-TracksuccesswithpercentofSLAsmet
You don't give a lot of info here about what you really used as settings.
But if i had to guess here, I would think it is because off a incorrect filter you used.
So please check your filter by going to issues ==> search for issues and copy pasting the filter there.
If the filter seems to be working please provide a little bit more data.
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