Getting an internal server http error

Hi,
As of yesterday we stopped receiving submissions on our forms. our site is http://www.useh.org/. when ever i try ti access any chronoforms options i get an error (see attachment . Sure if our license has expired or its something else. We are running Joomla 3.6.5

Hi socialbandit,
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Please go to the Joomla global config and set error reporting to maximum, do you receive an alternative error message ?
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This is not a validation problem, but maybe you server config was changed and it does not work well now with your v4 install
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Best regards