Issues and Errors

License Installation Errors

Notice: Undefined variable: vendor...

Cause
The error occurs due to a missing /system/license/sllic.lic file. This might happen if the license file wasn't installed or was installed incorrectly.

Solution
Review the License Installation documentation section. Reinstall the license following the instructions.

This is not licensed copy of attributipro

Cause
Your domain name doesn't match the license file configuration.

Solution
Check the License Installation documentation. Verify your domain name and reinstall the license accordingly.

Module Installation Errors

Fatal error: Uncaught exception 'Exception'...

Cause
Missing category_attribute table in the database. This usually occurs when modifiers are installed but the main module remains inactive.

Solution
Follow the Installation Guide, paying special attention to Step 3.

Module not activated or database structure corrupted!
Reactivate the module via Extensions->Modules.

Cause
Missing database tables/columns, possibly due to accidental deletion by user/third-party software, or after module updates.

Solution
Deactivate and reactivate the module. See Installation Guide.

Conflicts with Other Modules

When using multiple attribute management modules alongside Attribut&pro, note that most modify product edit forms or inject custom pages. This may cause integration issues and database conflicts.

Additionally, compatibility issues have been observed with modules using different jquery.ui versions (e.g., Admin_quick_edit_product_opencart1.5x.vqmod). These are resolved in recent Attribut&pro versions.

Runtime Errors

Load error! (SyntaxError: Unexpected token < in JSON at position 0)

Cause
Data structure corruption. Example: attribute_id in category_attribute table references non-existent records. Typically caused by operator errors, database query failures, or third-party module conflicts.

Solution
Restore from backup or repair corrupted entries (e.g., re-saving affected categories). Always maintain database backups.

note

Tip
If you've purchased Attribut&pro, use it for attribute management instead of manual OpenCart form edits. This reduces database error risks.

PHP Notice: Undefined offset: 1

Cause
Module code error. Check System ⇒ Tools ⇒ Error Logs and browser console for details.

Solution
Contact developer support.

Server Errors

Load error! (Internal Server Error)

Cause
Common on large stores due to timeout issues or Ioncube loader version mismatches between module and license file.

Solution

• Verify hosting/MySQL configuration
• Add to .htaccess: php_value max_execution_time 300 (if allowed by host)
• Enable lazy loading and caching
• Disable one child node in tree configuration
• Select correct distribution folder from archive

Modifier Installation Errors

Duplicate Attribut&pro menu items...

Cause
Duplicate modifiers: one in system/ folder, another installed via Extensions ⇒ Installer.

Solution
Follow the Installation/Update Guide. Remove redundant modifier.