twilight forest not activating

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    hi i wanted to play with my friend the twilight forest mod, i firsts tried it but it said that i needed to download the forge 1.14.4 so i downloaded it, even though the twilight forest version was the 1.12.2 but the server opened and i was happy, finally being able to play it, but the mod wont activate, and i dont know how, so im asking for your help, please