As seen in #30, #35, #39 and #40, this seems to be a quite common source of confusion. I tried looking around in CurseForge to find out if I needed anything else, only to start the game and having it crash because I couldn't find the info.

Bump/confirmation.
Please add link/text regarding dependency on the guide api mod to https://minecraft.curseforge.com/projects/modular-forcefield-system and/or add @mod declaration to the code so that loading will halt and state any missing dependencies instead of crashing.