Activation problem

Hello I recently purchased the plugin, after my activation I was working fine but sudenly i received the following message;

Your License Key is invalid.

License key mismatch. The license you entered doesn’t match the TranslatePress version you have installed.

Please check that you’ve installed the correct version for your license from your TranslatePress account.

I did what is needed synced with website but still not corrected. Please check what might be wrong.