Starting the plugin fails with:

[18:03:41] [Client thread/ERROR] [FML]: Exception loading blockstate for the variant bassebombecraft:randombookblock#normal:
java.lang.Exception: Could not load model definition for variant bassebombecraft:randombookblock
at net.minecraftforge.client.model.ModelLoader.getModelBlockDefinition(ModelLoader.java:274) ~[ModelLoader.class:?]
at net.minecraft.client.renderer.block.model.ModelBakery.loadBlock(ModelBakery.java:121) ~[ModelBakery.class:?]
at net.minecraftforge.client.model.ModelLoader.loadBlocks(ModelLoader.java:229) ~[ModelLoader.class:?]
at net.minecraftforge.client.model.ModelLoader.setupModelRegistry(ModelLoader.java:146) ~[ModelLoader.class:?]
at net.minecraft.client.renderer.block.model.ModelManager.onResourceManagerReload(ModelManager.java:28) [ModelManager.class:?]
at net.minecraft.client.resources.SimpleReloadableResourceManager.notifyReloadListeners(SimpleReloadableResourceManager.java:132) [SimpleReloadableResourceManager.class:?]
at net.minecraft.client.resources.SimpleReloadableResourceManager.reloadResources(SimpleReloadableResourceManager.java:113) [SimpleReloadableResourceManager.class:?]
at net.minecraft.client.Minecraft.refreshResources(Minecraft.java:798) [Minecraft.class:?]
at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:347) [FMLClientHandler.class:?]
at net.minecraft.client.Minecraft.init(Minecraft.java:560) [Minecraft.class:?]
at net.minecraft.client.Minecraft.run(Minecraft.java:385) [Minecraft.class:?]
at net.minecraft.client.main.Main.main(Main.java:118) [Main.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_111]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_111]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_111]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_111]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_111]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_111]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_111]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_111]
at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97) [start/:?]
at GradleStart.main(GradleStart.java:26) [start/:?]
Caused by: java.lang.RuntimeException: Encountered an exception when loading model definition of model bassebombecraft:blockstates/randombookblock.json
at net.minecraft.client.renderer.block.model.ModelBakery.loadMultipartMBD(ModelBakery.java:228) ~[ModelBakery.class:?]
at net.minecraft.client.renderer.block.model.ModelBakery.getModelBlockDefinition(ModelBakery.java:208) ~[ModelBakery.class:?]
at net.minecraftforge.client.model.ModelLoader.getModelBlockDefinition(ModelLoader.java:270) ~[ModelLoader.class:?]
... 23 more