https://gyazo.com/0391fb459a6f980ccc9085d479f3eb07

Description

After running my server for 30second I get this error and they right after it crashes.
I have newest version and everything but doesnt work rip.

• Minecraft Version:
• AE2 Version: appliedenergistics2-rv6-stable-6
• Forge Version: forge-1.12.2-14.23.5.2768

And is a server already running on that port?

I feel that the actual log would be significantly more useful than a screenshot of a stack trace, as I'm quite suspicious that your problem relates to AE2 not at all.