All modpacks freeze when launching

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Dheolos

Guest
Title All modpacks freeze when launching

Launcher Type FTB Launcher

Modpack all of them

Modpack version all

Have you modified the pack? No

Link to log file https://paste.feed-the-beast.com/view/ac4e736c

Details of the issue MacOS High Sierra 10.13.6
Issue happens regardless of whether I use Legacy launcher mac or legacy launcher Linux
The launcher works fine, but when I click Launch for any modpack, it freezes right after the FTB letters come together, there's a notice that says "FML is setting up your minecraft environment Minecraft validated, launching..." I'm unable to click anywhere on the application and I have to force close it.
 
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