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Edit: Could you post the log below as well. Remember to use pastbin or ftb paste
c:\ftb\FTBPresentsSkyfactory25\minecraft\hs_err_pid7160.log
@Kerajel Is correct this is an optifine issue. Check that chunk loading is set to normal. This may fix it but I would not recommend using optifine unless you can't do without it as you will most likely run into more issues.