Is this how it should be, or is it unintended?

I used 3 mods to check, blueprint, caverns&chasms and optifine got this error:

The game crashed: initializing game Error: net.minecraftforge.fml.ModLoadingException: Blueprint (blueprint) encountered an error during the common_setup event phase

To prove that the problem wasn't blueprint, I chose all the other Abnormals mods instead of caverns&chasms and the game loaded without errors.