Hi,
I was playing with Botania yesterday and I've come to login to my server today and my client continues to crash whilst trying to join. Seems to be related to the Botania mana pool. My area is also chunk loaded via FTBUtilities.

Error

The game crashed whilst ticking block entity
Error: java.lang.IllegalArgumentException: Cannot get property PropertyEnum{name=variant, clazz=class vazkii.botania.api.state.enums.PoolVariant, values=[DEFAULT, CREATIVE, DILUTED, FABULOUS]} as it does not exist in BlockStateContainer{block=minecraft:air, properties=[]}

Mods
Listed within the crash-report.

Crash Report
crash-2017-10-29_13.22.43-client.txt

After a bit of digging around in issue #2205 someone mentioned VoxelMap cache was their issue.
After removing VoxelMap (disabling through liteloader) I could log back onto my server. I'm going to be looking into alternative map mods as Voxel is rather dated at this point.
#2205 (comment)