Okay, so i had to reinstall tekkit then it worked, but now its not wroking again, when i go into my world it starts loading then goes back to the launcher.
https://pastebin.com/F4YaE62c
Every time i open tekkit it goes to the minecraft loading screen for about 5 seconds then it closes, i tried downloading tekkit classic and it worked with it, it seems like its not working only with tekkit. Crash report--> https://pastebin.com/jdeuRTF4
Crash report.txt