Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, no array or string given in /var/www/html/www.matters-of-activity.de/cache/templates/256a29127060783644bfb37fe274453c8ba4ce2c_0.file.main.tpl.php:52
Stack trace:
#0 /var/www/html/www.matters-of-activity.de/libs/sysplugins/smarty_template_resource_base.php(123): content_657056edad0440_54658230()
#1 /var/www/html/www.matters-of-activity.de/libs/sysplugins/smarty_template_compiled.php(114): Smarty_Template_Resource_Base->getRenderedTemplateCode()
#2 /var/www/html/www.matters-of-activity.de/libs/sysplugins/smarty_internal_template.php(217): Smarty_Template_Compiled->render()
#3 /var/www/html/www.matters-of-activity.de/libs/sysplugins/smarty_internal_template.php(386): Smarty_Internal_Template->render()
#4 /var/www/html/www.matters-of-activity.de/libs/sysplugins/smarty_internal_runtime_inheritance.php(116): Smarty_Internal_Template->_subTemplateRender()
#5 /var/www/html/www.matters-of-activity.de/cache/templates/6ea7cc455b48055d539d9658fca712b58f22faa3_0.file.errors_show.tpl.php(32): Smarty_Internal_Runtime_Inheritance->endChild()
#6 /var/www/html/www.matters-of-activity.de/libs/sysplugins/smarty_template_resource_base.php(123): content_650b00357d47b1_31070976()
#7 /var/www/html/www.matters-of-activity.de/libs/sysplugins/smarty_template_compiled.php(114): Smarty_Template_Resource_Base->getRenderedTemplateCode()
#8 /var/www/html/www.matters-of-activity.de/libs/sysplugins/smarty_internal_template.php(217): Smarty_Template_Compiled->render()
#9 /var/www/html/www.matters-of-activity.de/libs/sysplugins/smarty_internal_templatebase.php(238): Smarty_Internal_Template->render()
#10 /var/www/html/www.matters-of-activity.de/libs/sysplugins/smarty_internal_templatebase.php(134): Smarty_Internal_TemplateBase->_execute()
#11 /var/www/html/www.matters-of-activity.de/controllers/systemantics.inc.php(60): Smarty_Internal_TemplateBase->display()
#12 /var/www/html/www.matters-of-activity.de/controllers/activities_ical.inc.php(35): error()
#13 /var/www/html/www.matters-of-activity.de/main.php(193): include('...')
#14 {main}
thrown in /var/www/html/www.matters-of-activity.de/cache/templates/256a29127060783644bfb37fe274453c8ba4ce2c_0.file.main.tpl.php on line 52