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You are not the only one. Got the same problem as you. I downloaded the MrTJPCore file and moved it manually into the mods folder. But then the minecraft window appears and vanishes after a second. Crashlog tells me Java has a problem with the MrJPCore file but when I remove it from the mods folder I get the "MrTJPCore file missing" message again. Did you by any chance contact the mod author already?