Error with mods and optifine.

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    Hi, when i created a server it worked perfectly but the next day i tried to enter and it was not possible, this happened to me with a server before but i eliminated it, but now i tried to enter the server without optifine and it worked perfectly, and its not a problem of the mods bc i can enter normal worlds without problem, pls tell me what to do bc the difference of playing with and without optifine is horrible.