Support » Plugin: Contact Form 7 » Fatal error: Unknown

  • Hello,
    I’m having trouble when the plugin is activated.
    If I want to access the “Add” page (post-new.php for example), I get an error (debug active):
    Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0

    I disabled all my plugins, and the one which makes trouble is Contact Form 7.

    What is wrong ?

    Thank you for your help

    https://wordpress.org/plugins/contact-form-7/

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