Error message after upgrade

Error message after upgrade

by William Fraser -
Number of replies: 0

Hi

Having upgraded to 1.6.2, I now get the following error message and cannot add any new blocks...can anyone tell me how to fix this in simple language!

Fatal error: Call to undefined method block_activity_modules::user_can_addto() in c:\moodle\web\lib\blocklib.php on line 826

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