• Ver Alvin Makiramdam
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I have this error for all my 500 points challenges since two weeks ago.  I have searched other posts and checked that I am using the same account for my trailhead and my developer.org.  I have tried to use different browsers, Chrome, IE and Firefox to have the same error.  It becomes very frustrated now.  I do have successful experience with the "Check challenge" of 500 points challenge before.