If you've been flashing custom ROMs, your device ID might have changed.
Apparently the device ID changes when you flash a new ROM.
What you can do to check is:
1. Download "Device ID" from play store (on your phone).
2. Open the app so it displays your current device ID.
3. In chrome, go to settings > tools > extensions.
4. Click on the "options" link under APK Downloader.
5. Compare the device ID displayed on the options page (in chrome) with the one displayed by the Device ID app (on your phone).
6. If the two IDs are different, click on "logout" on the options page.
7. Update your details and click on "login".
This worked for me
