This seems to be caused by a problem in the ClearValidatorCallouts
for more information). The ClearValidatorCallouts
() code from the page you gave, goes through all validators on the page and uses their "controltovalidate" property. If a validator does not have this property (such as a CustomValidator
or RadCaptcha), the code will fail.
You should contact the author and ask if there is a newer version available or you can apply this simple fix:
change line 51 in validators.js
if (inputControl) WebForm_RemoveClassName(inputControl, 'error');
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