Unfortunately this stack trace doesn’t have the NPE in it.
On the Gateway’s file system, in your Ignition folder you can go to data/projects//com.inductiveautomation.reporting/reports and remove the folder that corresponds to the name of your report (copy it somewhere else if you don’t want to lose the report) – this will let you get the designer open. (You may need to wait a few minutes for the gateway to realize the resource is gone, but I don’t think you’ll need a gateway restart on 8.1.7)
If one of the files in that folder is 0k then it got corrupted you’ll need to replace it from a backup. If that’s the case, you might want to consider updating to a more recent version of Ignition. If that’s not the case, you might want to contact support so they can help you figure out what the issue is.
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