Hi,
I've been having a problem with technic launcher on my niece's computer, on which I had installed it.
I encountered a lot of problems
Firstly, there was different error, after hours of trying everything what I could find (updating drivers, clearing PATH in enviroment for java and reinstalling it), I found a fix on reddit:
to change
B:allowUpdateCheck=true
in .technic\modpacks\tekkitmain\config\bspkrsCore.cfg to false
This resulted in game opening and working, but when I created and opened a world, I couldn't see anything (possibly optifine draw distance setting, didn't check), I tried to reset the game, and new error appeared, resulting in game not opening again.
Launcher log
Modpack log (AppData\Roaming\.technic\modpacks\tekkitmain\hs_err_pid2084.log) [Can't post the whole thing, too long, where there are ... indicates repetition of lines that are alike.
I can post the logs from previous error, before changing the .cfg if needed.