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Katja FeldtmannKatja Feldtmann 

Error: YXJGSSXW

I have tried both, Trailhead Playground and the Developer Edition, but keepp getting this error. Please help.

Challenge Not yet complete... here's what's wrong:
There was an unexpected error while verifying this challenge. Usually this is due to some pre-existing configuration or code in the challenge Org. We recommend using a new Developer Edition (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: YXJGSSXW
Katie KourtakisKatie Kourtakis
Hey Katja

I was recieving a similar error while trying to complete the reports and dashboards challenge on the busienss admin superbadge. I had made changes to my reports but hadn't refreshed my dashboards which were using the reports before submitting. The error went away once I refreshed the dashboards. 

I'm not sure if this is applicable to what you are experiencing but it worked for me.