What This Means
The WHMCS “Oops!” message usually indicates a PHP exception or fatal error.
Step 1: Check WHMCS Activity Log
- Go to Utilities > Logs > Activity Log
- Find the entry at the time the error occurred
- Note the error message and file path
Step 2: Most Common Causes
- Missing PHP extension (cURL/OpenSSL)
- Directory permissions preventing temp/log writing
- Invalid provider credentials causing API failure
- Incomplete update (files updated but schema/migrations not applied)
Step 3: Fix and Re-Test
- Apply the fix
- Refresh the admin page
- Re-run the same action