I have a forge development environment set up for 1.11, and when I try to run the forge client, I get this error:
I had a working set up for 1.10.x, but when I tried updating to 1.11.x, this started happening. I thought maybe it was some of the changes I'd made, but I'm still getting the same error when using a fresh clone from GitHub, on both 1.10.x and 1.11.x. In the clean environment, I've made no changes to the code, it's set up exactly as described in cpw's video. Running vanilla Minecraft in the same environment works fine.
Any help is greatly appreciated!
Thanks