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Error : Smarty error: [in /www/wwwroot/sf/html/themes/school2022/tpl/custom_content.tpl line 17]: [plugin] unknown tag - 'xoBlock' (core.load_plugins.php, line 118)

Backtrace:
/class/smarty/Smarty.class.php (1100)
/class/smarty/Smarty.class.php (1822)
/class/smarty/internals/core.load_plugins.php (118)
/www/wwwroot/sf/xoops_data/caches/smarty_compile/0446d128-science_fair-school2022-default^%%0E^0EE^0EE19BA6%%custom_content.tpl.php (4)
/class/smarty/Smarty.class.php (1876)
/www/wwwroot/sf/xoops_data/caches/smarty_compile/0446d128-science_fair-school2022-default^%%AA^AA2^AA2403B7%%logo_wrapper.tpl.php (69)
/class/smarty/Smarty.class.php (1876)
/www/wwwroot/sf/xoops_data/caches/smarty_compile/0446d128-science_fair-school2022-default^%%BA^BA4^BA472EE6%%theme.tpl.php (109)
/class/smarty/Smarty.class.php (1263)
/class/smarty/Smarty.class.php (1113)
/class/theme.php (531)
/footer.php (66)
/modules/science_fair/search.php (288)