Admin Area Not Loading After Server Move

Hi guys, I hope someone can help me

I recently moved from Siteground hosting to Bluehost

The back end of my site is now inaccessible, I get a "Service Unavalaible" full page notice, I searched here and found a line of code to add to config_local.php to display the error and this is what I get:

SOLVED, some files in the app folder had gotten corrupted during the transfer

Any help is appreciated

Thanks in advance

SOLVED, some files in the app folder had gotten corrupted during the transfer