Ugdhar

I honestly have no idea what is causing that crash. To me, it looks like your minecraft installation is broken Maybe try deleting/reinstalling the modpack? If you make a new profile, and don't choose any mods, just a basic forge setup, does it launch?

On the screen that shows the modpacks you have installed, right-click on the modpack, and choose Open Folder. That'll bring you into the folder that contains the logs folder, which should contain the fml-client-latest.log

Good deal. Also, when you're going to post it, before you paste it, click the eyeball button to post it in spoiler tags. Makes the page much easier to follow.

Depends where you are launching minecraft from. I saw a mention of curse in there, so if you're using the twitch client, there should be a button in the profile options to open the containing folder, and within there should be a logs folder containing that file.

Please post the logs/fml-client-latest.log file

Yeah it looks like you're attempting to use gui/client stuff on the server. You should post your code to a github repo and link it here for people to take a look. Posting snippets or individual classes usually doesn't provide enough information to pinpoint the issue.

Sorry, Minecraft 1.7.10 is no longer supported here. It is advised to use the latest version for mod development.

This is a fresh install right? You didn't copy it it over your old 2.5 install? Also, which version of java are you using?

Windows explorer (file browser) is not the same as Edge (web browser). Press the windows key + E to open windows explorer.

1.7.10 is also no longer supported here FYI

- Are you running your server from a batch (.BAT) file? If so, check that for the 256M setting. - Open a command window, and type SET and you will get a list of your environment variables. Look through them and see if there are any Java options in there with the 256M setting. If there are, you will need to go into your system settings to remove them. https://winaero.com/blog/how-to-edit-environment-variables-quickly-in-windows-8-1-and-windows-8/

Also just noticed, this is 32-bit java, you're likely to run into memory issues. I'd remove it and install the 64 bit (it will say 64 bit on the HotSpot Client line when you have it)

It is setupDecompWorkspace

The client does not exist within the server, I think your code is reaching across sides.

Post your fml-server-latest.log after your friend tries to connect.

Have you tried deleting and re-creating the profile so it redownloads minecraft? If not I'd give that a try

Try disabling the loading screen as described in the EAQ, I've seen that suggested for this error before. (I just used the forums search box at the top of the page and typed in "pixel format not accelerated".)

1.7.10 is no longer supported, you'll have to update to get help. (also, your pastebin links are broken)

1.7.10 is no longer supported here, you'll have to updated to get help.

In the launcher, after choosing the profile to launch, go to Launch Options at the top, and the Game Directory shown should contain a logs folder, which will have the fml-client-latest.log in it. There's even a little arrow next to Game Directory that lets you open right to the folder that should have the logs folder. *edit: I tried to paste a screenshot, but evidently I must need to upload it somewhere, but I think you should be ok to find it.

You need to use Java 8, 9 isn't supported

Yeah, but I think it's the size of the minecraft code that requires 64 bit/more memory. @diesieben07 confirm?

Make sure you are using 64 bit java would be my guess

Post logs and specifics

Just to throw this out there, the first log you posted shows minecraft 1.10.2, and this last one you posted shows 1.11.2, so you could very well have some mixup on versions going on.