Hi Guys, I need help

Hello Guys, Saint6035 here. I was shifting my SMF Forum from a subdomain to a custom domain but now I can’t install mods to it. I tried using 755 and 777 chmod perms but no luck.
Here’s what I see:

And to be clear, I migrated a forum from my old domain, this wasn’t installed from Softaculous. Please help.
And the image above is incorrect sorry. Here’s what I wanted to add :

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