Got this on facebook today for 2 of my network apps so far...
Once your app is compliant, set the migration setting to "Enabled" in the Advanced section of the App Dashboard.These changes will be permanently enabled for all apps in 1 day on Tuesday, February 5, 2013.
UPDATE: Got a VERY helpful response from Ning below and just wanted to put it here to save people digging through the comments in a panic:
Just got this message myself and went through the flow. I'll publish a tutorial replete with screenshots and a brief overview of what Facebook's been up to and why they require this compliance shortly. If you just want to get it over with, follow these steps:
Head to your Facebook Developers page, log in, select your app, click "Edit Migrations," scroll down to the Migrations section, select the "enabled" radio button next to "February 6th Breaking Changes" and click "Save."
UPDATE 2 - The tutorial to solve the issue is linked here: