<ul><li><strong>Root Cause:</strong> Module ID 351 does not exist in domain_controlpanel (IDs jump from 46 to 1993+). User was navigating to a non-existent module ID, likely a stale bookmark or manual URL entry.</li><li><strong>Secondary Bug FIXED:</strong> /website/website_status/ directory was entirely missing, causing all platform 403 error redirects (module_not_found, module_purchase, account_rid, role_insufficient, etc.) to return HTTP 404 instead of a proper error page.</li><li><strong>Fix:</strong> Created /website/website_status/index.php — standalone UBOLD4-styled error page that handles error code and reason parameters (module_not_found, module_purchase, account_rid, account_security, account_superadmin, role_insufficient, module_invalid) with human-readable messages and Return to Platform link.</li><li><strong>Verified:</strong> HTTP 200, correct message display, all platform error redirects now resolve to valid page.</li></ul>