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Can´t launch modpacks which are not official


OrionSchocolade

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post the log then

logs can be found when clicking the Cog-Wheel button on the top right corner on the launcher window.
If you can't open the launcher the logs can also be found inside %appdata% -> Roaming -> .technic -> logs

Paste the content on pastebin.com or paste.ubuntu.com and give the link.

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[SEVERE] [ForgeModLoader] Unable to launch
 [INFO]  java.util.ConcurrentModificationException

I should have guessed this. Report any modpack(s) that is giving you this error line, they should have been fixed by the modpack author(s) months ago.

this is an error with your java and the modpacks Forge. It is easily fixable by googling JavaLegacyFixer by LexManos, but the modpack authors should have included this in their packs themselves

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