https://pastebin.com/R9reEMu3
Description: There was a severe problem during mod loading that has caused the game to fail

net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from RFTools Dimensions (rftoolsdim)
Caused by: java.lang.NoSuchMethodError: mcjty.lib.McJtyRegister.registerLater(Lnet/minecraft/block/Block;Lmcjty/lib/base/ModBase;Ljava/lang/Class;Ljava/lang/Class;)V
at mcjty.rftoolsdim.blocks.shards.DimensionalBlankBlock.(DimensionalBlankBlock.java:24)
Rest of issue is at the linked pastebin.

Update RFTools Dimensions to 5.10 and see if that fixes it. If it doesn't, can you post the version of McJtyLib you're using? (If it's not 2.6.1, try updating it too.)

lib was already up to date. Did not recall dimensions. Issue is fixed thanks for your assistance.