Bug Can't launch modpacks in the new launcher (MacOS)

[Zikdak]

Everytime I try press play on a modpack it gives me the "Problem report for launcher" window.
After I press reopen, the normal vanilla launcher opens. I can post the logs of the problem report prompt on pastebin for those who are interested in it.
I tried 2 modpacks, both resulted in the same error.

The old launcher works fine btw, but I can't play the latest version of Direwolf on the old one.

 

[miriad]

The same is happening to me. Have you found a solution?

 

[Zikdak]

The same is happening to me. Have you found a solution?

No I haven't. My friends have decided to downgrade to the 2.5 version for me.
Still don't know how to fix this or what actually causes the problem.

 

[Zikdak]

Still haven't found a solution to this.

 

[Zikdak]

Bump

 

[PandazGaming]

Same but I can't even download the modpacks