Hello, I'm using the latest Forge (10.13.0.1187) and Minecraft 1.7.10. This error happened in a dev enviroment, but the stack trace doesn't say anything about my mod, so I'm posting this issue here. Basically, the server runs fine, but when I try to connect to it with client, the client crashes. Here are the Forge logs:

server > https://gist.github.com/anonymous/37914c517774ff094c35

Note: The error at line 183 is something else, it happens while closing the server manually. Client crash is at line 91.

client > https://gist.github.com/anonymous/577de12346e8fb31718a

From line 156.

Default ForgeGradle ones, except I changed the username in client to my own.

CLIENT

Main class: GradleStart

JVM: -Xincgc -Xmx1024M -Xms1024M -Djava.library.path="D:/Programowanie/Java/MinecraftForgeDev\build\natives" -Dfml.ignoreInvalidMinecraftCertificates=true

Program arguments: --username=Vtec234

SERVER

Main class: GradleStartServer

JVM: -Xincgc -Dfml.ignoreInvalidMinecraftCertificates=true

Program arguments: none

Thanks, I was actually wondering why I still had the default skin. It works with --username and --password. However, when I don't provide anything and use the default ForgeDevName I get the same crash. Does that mean you have to have bought Minecraft in order to test server-client?

I have bought the game, it's just theoretical. And yes, you CAN run the game as ForgeDevName, but as I said before, you can't connect to the server (I get the same crash as when using only --username).