Written
These are PHP strict standards warning messages which are harmless. To hide them you can set "Error reporting" to System Default or 'None' in your Joomla! site Global Configuration.
If this doesn't work you may need to change the error_reporting flag in your PHP configuration php.ini file to the production setting:
error_reporting = E_ALL & ~E_STRICT
It may also be helpful to make sure that you are using the most recent release of ChronoForms for your Joomla! version.
