Fatal error: Uncaught Error: Call to undefined function wpcf7

To disable the plugin you can log into cPanel or into the installation folder via FTP and rename or remove the plugin folder in /wp-content/plugins/ – Once you’ve done this you should be able to login to the dashboard without any issues.

There is possibly a conflict between the current theme and the Contact Form 7 plugin that you are trying to use. Maybe try an alternative contact form plugin like Gravity Forms and see if you have the same problem.

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