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Error: Call to a member function getVars() on bool

Error: Call to a member function getVars() on bool in /mnt/web317/b2/46/53925946/htdocs/modules/extcal/class/ExtcalPersistableObjectHandler.php:490
Stack trace:
#0 /mnt/web317/b2/46/53925946/htdocs/modules/extcal/print.php(12): ExtcalPersistableObjectHandler->objectToArray(false, Array)
#1 {main}