So what happened was that i am using forge and when i pressed play, it said that the game couldn't be launched because of a file called "Jopt-simple-4.5.jar".
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Thank you for your report!
However, this issue is Invalid.
Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run modified server software.
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Isn't this irrelevant because it is a modded client?