Describe the bug
Upon launching the game, I am met with this page.

To Reproduce
Steps to reproduce the behavior:

1. Install Minecraft 1.14.4, Forge 28.2.6, and The Community Update 1.14.4-0.1.4
2. Launch the game

Expected behavior
Successful launch

Screenshots
https://imgur.com/a/OHZx9gi

Desktop (please complete the following information):

• Minecraft Version 1.14.4
• The Community Update 1.14.4-0.1.4
• Forge Version 28.2.6

Additional context
Latest.log https://pastebin.com/yd9b5jWY
Launched via the Twitch App

Try using the stable Forge versions, or Forge version 28.2.3. This mod was built on 28.2.3, and it looks like in 28.2.6 some deobfuscation (in particular, the skinMap field) hasn't been mapped yet. You shouldn't miss anything from the forge version downgrade, I personally run everything on 28.2.3!