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There could be several reasons why a macro may be displaying an error when executed from a customized ribbon. Some possible reasons include:

1. Incorrect macro code: The macro code may contain errors or bugs that cause it to malfunction. Make sure the code is properly written and debugged before executing it from the ribbon.

2. Incorrect macro location: The macro may be stored in the wrong location, making it inaccessible from the ribbon. Make sure the macro is stored in a location that can be accessed through the ribbon.

3. Incorrect ribbon configuration: The ribbon may have been configured incorrectly, such as specifying the wrong macro or file name. Double-check the ribbon configuration to ensure everything is set up correctly.

4. Security settings: The macro may be blocked by security settings in Excel, preventing it from executing. Check the security settings and ensure that macro security is enabled.

5. Compatibility issues: The macro may be incompatible with the version of Excel being used. Check the compatibility of the macro and Excel version to ensure they are compatible.

It is important to troubleshoot the issue systematically to identify the root cause and resolve it accordingly.