[Plugin: Contact Form 7] JS Error when submit form

i’ve updated both wordpress and contact form plugin to the newest version and it still doesn’t work for me…

The error is not from Contact Form 7. Try deactivating all other plugins and switching to the default theme.

i’ve disabled every plugin but it still doesn’t work ??

I’ve tried to create another form and it retrieve the same error.

I see that if i alert the “data” variable (in script.js) when not all of the fields of the form are filled it works! but if all is filled it shows this error!

I am getting the same error, when setting Contact Form 7 file upload size limit more then 1MB.