The Alpacabeard error can be caused by various reasons:
- Game Licence - check that your Steam purchase of the game did not fail due to payment issues
- Steam login - you may be logged in to an incorrect Steam account that does not own the game license
- Corrupted Game client - to solve this issue, please uninstall and reinstall the game and try again
- Corrupted Steam application - uninstall the Steam client application and reinstall, making sure that you only have one copy of the Steam client installed on your PC
