Quick lookup.
BLANK PAGE
Application log, then server error log.
CHANGES NOT APPEARING
Configuration or route cache. Rebuild.
ACCESS DENIED FOR DATABASE
cPanel prefix missing, or privileges not granted.
PERMISSION DENIED WRITING
Storage not writable. The error names the path.
CLASS NOT FOUND
Dependencies not installed, or installed under a different PHP version.
NOT FOUND ON EVERY ROUTE BUT THE FIRST
Rewrite rules missing.
IMAGES AND STYLES MISSING
Public contents not in the served directory, or application address wrong.
UPLOADED FILES NOT REACHABLE
Storage link missing.
SCHEDULED TASKS NOT RUNNING
Cron entry, PHP path, or application path.
MAIL NOT ARRIVING
Credentials, authentication records, or queued mail with no worker.
SLOW PAGES
Query count. Look for relationship access in loops.
WORKS LOCALLY, FAILS LIVE
PHP version, dependency versions, environment values, caches, permissions, filename case.
