Cannot register key for nms360 md

I recently reset my android 4.0 tablet. A message displays having trouble registering key. I was signed into my acct, and it shows Lite Version. I have 3installs left. Please help. Thanks.

I recently reset my android 4.0 tablet. A message displays having trouble registering key. I was signed into my acct, and it shows Lite Version. I have 3installs left. Please help. Thanks.