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

Backtrace:
/kernel/module.php (314)
/kernel/module.php (164)
/modules/system/blocks/system_blocks.php (138)
/kernel/block.php (507)
/class/theme_blocks.php (204)
/class/theme_blocks.php (132)
/class/theme_blocks.php (51)
/class/theme.php (402)
/class/theme.php (95)
/header.php (55)
/include/common.php (354)
/mainfile.php (82)
/modules/extcal/include/constantes.php (23)
/modules/extcal/view_agenda-week.php (12)