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After installing JEI and pixelmon reforged on my single player world, it mostly works but states that JEI needs to be installed on the server when I try to autofill the recipe, even for vanilla Minecraft items

Hey i may be a bit out of topics but can you help me out with this Error it Very annoying the error is "file ____ is not a jar file" i have the same version as yours "1.16.5 forge" so please can u solve it i kinda start to loss hope in it :(