Unable load external form block controller file: error_log

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I recently helped put together a site for someone and things have been working well until I got this error:

Unable load external form block controller file: error_log

It shows up when trying to log into the site. So I'm not even able to get into the dashboard or anything.

I'm not as knowledge about the coding side of things, which is why I chose C5 because it's user-friendly. Would really appreciate any suggestions.

 

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