Category Archives: Dot Net Nuke

Dot Net Nuke – A critical error has occurred. An unexpected error has occurred

Some of you might have seen this error after upgrading your DNN from v6 to v7.  It’s a bit scarey because it means that no-one can log into your DNN instance, not even a super user.  Troubleshooting must therefore begin on the hosting server.  Check out the log files under .Portals_defaultLogs.  For me the critical error was:

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