Look like something wrong with wddx itself. Rename /opt/php54s/etc/php.d/wddx.ini to wddx.nonini and then restart Kloxo panel will be fix this issue.
cat /opt/php54s/custom/*.sh
#!/bin/sh
php_rc="/opt/php54s/custom/php.ini"
php_scan='/opt/php54s/etc/php.d'
php_prog='/opt/php54s/usr/bin/php-cgi'
export PHPRC=$php_rc
#export PHP_INI_SCAN_DIR=$php_scan
exec $php_prog -c $php_rc $*#!/bin/sh
php_rc='/opt/php54s/custom/php.ini'
php_scan='/opt/php54s/etc/php.d'
php_prog='/opt/php54s/usr/bin/php'
export PHPRC=$php_rc
#export PHP_INI_SCAN_DIR=$php_scan
exec $php_prog -c $php_rc $*#!/bin/sh
php_rc='/opt/php54s/custom/php.ini'
php_scan='/opt/php54s/etc/php.d'
php_prog='/opt/php54s/usr/sbin/php-fpm'
export PHPRC=$php_rc
#export PHP_INI_SCAN_DIR=$php_scan
exec $php_prog -c $php_rc $*#!/bin/sh
php_rc="/opt/php54s/custom/php.ini"
php_scan='/opt/php54s/etc/php.d'
php_prog='/opt/php54s/usr/bin/php-ls'
#export PHPRC=$php_rc
#export PHP_INI_SCAN_DIR=$php_scan