Fatal error: Cannot use object of type __PHP_Incomplete_Class as array

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Anybody knows what's going on - when I try to login to administration, after I enter username and password I get this message: Fatal error: Cannot use object of type __PHP_Incomplete_Class as array in /home/baskagra/public_html/updates/concrete5.6.3.1_updater/concrete/startup/session.php on line 42

Any clue what should I do?

Thank you in advance.

graviton
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harveyappleton replied on at Permalink Reply
harveyappleton
Clear your cookies for that one site, its some sort of session error. Then it works. Maybe upgrading to 5.6.3.1 would help too? I'm plagued by it too!