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Error : Error: Call to undefined method XoopsMySQLDatabaseProxy::exec()

Backtrace:
/home/nc/nc_lib/modules/protector/include/postcheck_functions.php (146)
/home/nc/nc_lib/modules/protector/include/postcheck.inc.php (15)
/modules/protector/preloads/core.php (43)
/class/preload.php (141)
/include/common.php (397)
/mainfile.php (83)
/index.php (23)