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Error : Error: Class "XoopsModules/Extcal/Perm" not found

Backtrace:
/modules/extcal/class/Helper.php (79)
/modules/extcal/xoops_version.php (82)
/kernel/module.php (328)
/kernel/module.php (178)
/modules/system/blocks/system_blocks.php (145)
/kernel/block.php (729)
/class/theme_blocks.php (202)
/class/theme_blocks.php (130)
/class/theme_blocks.php (49)
/class/theme.php (404)
/class/theme.php (97)
/header.php (53)
/modules/extcal/header.php (35)
/modules/extcal/index.php (7)