As of BiomesOPlenty-1.7.10-2.1.0.1283 & TheErebus-0.2b, there's an issue with Honey fluid:
[15:38:20] [Server thread/WARN]: A mod has attempted to assign Block erebus.block.BlockErebusHoney@17bb584 to the Fluid 'honey' but this Fluid has already been linked to the Block biomesoplenty.common.fluids.blocks.BlockHoneyFluid@6fcf5bb5. You may have duplicate Fluid Blocks as a result. It may be possible to configure your mods to avoid this.

@LemADEC if you know how to fix this, maybe you can send a PR? Since 1.7.10 version is no longer in development.