This error is very common, and simple to fix.

To fix it you need just to:

Logout your Minecraft Account through your launcher.
Login in your Minecraft Account through your launcher.

You can also get this message when logging to the server with a non-premium (cracked) account.

To allow non-premium players to join the server follow these steps:

Go to your multicraft server from the panel (mc.ggservers.com)
Click on Files
Click on Config Files
Click on Server Settings
Set "Online Mode" to disabled
Click Save
Restart your server

If you wish, this article must help you:
https://help.ggservers.com/en-us/article/how-to-change-your-server-to-offline-mode-1l5bcz6/

Feel free to open a ticket in your Client Area if you still getting this error.
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