: If you are logging tags or alarms on a PC station, you must acquire the license for WinCC Logging for Runtime Advanced (e.g., MLFB: 6AV2107-0GA00-0BB0).
Ensure the logging license is actually installed on the PC or a connected USB drive. : If you are logging tags or alarms
: The license is mandatory only when the project is deployed to a productive PC system. 4. Resolution Steps Purchase/Install License Identify the Exact Missing License
If you don't intend to use logging and want the error to stop, you must disable the logging services in your project: : If you are logging tags or alarms
: If the PC experienced an improper shutdown or power failure, an existing license may be marked as "defective" in the [Automation License Manager (ALM)](siemens.com (alm)-download?dti=0&lc=en-WW "Download Siemens ALM"). Step-by-Step Solutions 1. Identify the Exact Missing License