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Recognize & Fix Common Errors

Here you will find an overview of common web hosting issues and their solutions – specifically related to Plesk and popular CMS systems like WordPress, Joomla, or Shopware.

Error Message Meaning / Solution
Allowed memory size exhausted memory_limit too low – check package
Maximum execution time exceeded Script runs too long – max_execution_time
Cannot redeclare function File included multiple times
Syntax error, unexpected T_* Typo in PHP file
Call to undefined function Missing extension or Composer dependency

CMS-specific

Error / Symptom Cause
WordPress shows a blank page Plugin/Theme conflict, enable wp-debug
Joomla Error 500 Incorrect configuration.php or database access
Shopware backend not loading Theme cache or outdated PHP version
Laravel .env file ignored Permission issue or incorrect path

.htaccess & Rewrite Issues

  • Rewrite rules cause redirect loops
  • Options directive blocked in shared hosting
  • mod_rewrite not active → Plesk uses nginx + Apache (consider combination)

Additional Notes

  • Check file permissions:
    Files 644, folders 755. Avoid using 777.

  • Want to see error messages?
    → display_errors = On only temporarily!

  • phpMyAdmin shows error during import?
    → File too large → upload_max_filesize, post_max_size limited by package