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Error : Error: Call to a member function _get_plugin_filepath() on null

Backtrace:
/class/template.php (107)
/class/template.php (54)
/class/theme.php (291)
/class/theme.php (93)
/header.php (53)
/modules/extcal/header.php (35)
/modules/extcal/view_day.php (31)