Error establishing a database connection on a site I did not create

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Hello! I am very new to projectdmc.org and I am having trouble with a website. I wanted to help a friend with the design of his website. He did not create it himself, someone else did. This person gave us the wp-admin credentials and I have been able to do some fixes on the site these days. Today I tried to log in and I am getting the ‘Error establishing a database connection’ error. I have no idea if I caused this error, I can understand that it’s probably impossible for me to do that since almost all the fixes I have read require you to check the credentials in the wp-config.php file, which I did not even know existed and I don’t think I have access to. Is there any chance I did something wrong? I’d like to exclude this possibility before contacting the creator of the website. Thanks!

The page I need help with: [log in to see the link]

 

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