This occurs because your game client does not match the version on our servers.

Information on how to restore your Diablo III character

How to block communication from another player in StarCraft II.

How to block communication from another player in Heroes of the Storm.

Black Screen when starting StarCraft II.

Troubleshooting steps for Diablo II (2000) performance issues

How to block communication from another player in Diablo III.

Command line arguments for Diablo II (2000)

Troubleshooting black screen crashes in Heroes of the Storm

If you experience crashes, blue or black screens, performance issues, or your computer locks up while playing, follow the steps below to resolve these issues.