Technic launcher won't launch modpacks

[Storkbrain100]

When I open technic launcher I launch a modpack and then the technic launcher closes and immediately re-opens. 

I've tried:

reinstalling java (multiple times)

changing java versions

uninstalling technic (multiple times)

I've tried many modpacks

I've changed the amount of memory.

If anyone has any ideas on something that  might help please tell me.

thanks.

[Munaus]

post your log using the pastebin service and post the link here

'logs can be found by clicking the Cog-Wheel button on the top right corner on the launcher window.
Paste it on pastebin.com and give us a link

alternatively, join us at Technic Discord where our bots can find the answer immediately when you post the log if it knows the issue.