You might see this error when you try to start the console 180 days after the installation of System Center Operations Manager 2012 SP1.
If you scroll down in Additional Information you will find the message:
You have exceeded the evaluation period of this product. Please upgrade to the retail version to continue using the product.
The same information can be found in the event log with event id 26319:
To upgrade from an evaluation version of Operations Manager to a licensed version, you must of course first obtain a valid product key from Microsoft.
Then start PowerShell as administrator.
Use the two commands as shown here, with your key:
Set-SCOMLicense –ProductId “Key”
Restart System Center Data Access Service and start the console again.