This message is displayed in two scenarios.

1. You do not have your TSM Desktop Application installed, configured, and running. Ensure you have done this by checking the article: How do I set up the TSM Desktop Application?

2. If you have verified the TSM Desktop Application is installed, configured, and running - it may be that your pricing data in-game is older than expected. You can run the /reload command in-game to populate newer pricing data from the App if it is available.