You need to patch the Battle.net desktop app in order to uninstall.

The Battle.net desktop app is trying to connect to an invalid or nonexistent server.

Information on error BLZAPPBTS0000F

The Battle.net desktop app is trying to connect to an invalid or nonexistent server.

You have attempted to connect to an invalid server. If this problem persists, please contact Customer Support.

Troubleshooting for problems installing or patching the Heroes of the Storm game client

Types of issues Blizzard Customer Support can help you with on Activision games

Information on error BLZBNTBNA00000131

There is insufficient space on your hard drive. Please clear some space or select a different drive and try again.

Information on error BLZBNTBNA00000003