Fatal error: Call to undefined function get_header() and BuddyPress [closed]

Not sure what the problem, but I moved the site to a new web host and all is well. It’s resolved, but I really wish I knew what caused the weirdness to begin with, in case I run into it again. Thanks for your help, kaiser.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)