Tried loading .obj in the blockstates .json, it gave me this

 

 

[15:03:50] [Thread-9/INFO]: OpenAL initialized.
[15:03:50] [sound Library Loader/INFO]: Sound engine started
[15:04:06] [Client thread/INFO] [FML]: OBJModel: A color has already been defined for material 'ID22' in 'valkyrianwarfare:models/block/pi.obj.mtl'. The color defined by key 'Ka' will not be applied!
[15:04:06] [Client thread/INFO] [FML]: OBJModel: A color has already been defined for material 'ID22' in 'valkyrianwarfare:models/block/pi.obj.mtl'. The color defined by key 'Ks' will not be applied!
[15:04:06] [Client thread/INFO] [FML]: OBJLoader.MaterialLibrary: key 'Ke' (model: 'valkyrianwarfare:models/block/pi.obj.mtl') is not currently supported, skipping
[15:04:06] [Client thread/INFO] [FML]: OBJLoader.MaterialLibrary: key 'Ns' (model: 'valkyrianwarfare:models/block/pi.obj.mtl') is not currently supported, skipping
[15:04:06] [Client thread/INFO] [FML]: OBJLoader.MaterialLibrary: key 'illum' (model: 'valkyrianwarfare:models/block/pi.obj.mtl') is not currently supported, skipping
[15:04:06] [Client thread/INFO] [FML]: OBJModel: A color has already been defined for material 'ID5' in 'valkyrianwarfare:models/block/pi.obj.mtl'. The color defined by key 'Ka' will not be applied!
[15:04:06] [Client thread/INFO] [FML]: OBJModel: A color has already been defined for material 'ID5' in 'valkyrianwarfare:models/block/pi.obj.mtl'. The color defined by key 'Ks' will not be applied!
[15:04:06] [Client thread/INFO] [FML]: OBJModel: A color has already been defined for material 'ID59' in 'valkyrianwarfare:models/block/pi.obj.mtl'. The color defined by key 'Ka' will not be applied!
[15:04:06] [Client thread/INFO] [FML]: OBJModel: A color has already been defined for material 'ID59' in 'valkyrianwarfare:models/block/pi.obj.mtl'. The color defined by key 'Ks' will not be applied!
[15:04:06] [Client thread/INFO] [FML]: OBJModel: A color has already been defined for material 'ID9' in 'valkyrianwarfare:models/block/pi.obj.mtl'. The color defined by key 'Ka' will not be applied!
[15:04:06] [Client thread/INFO] [FML]: OBJModel: A color has already been defined for material 'ID9' in 'valkyrianwarfare:models/block/pi.obj.mtl'. The color defined by key 'Ks' will not be applied!
[15:04:06] [Client thread/ERROR] [FML]: Exception loading model valkyrianwarfare:block/pi.obj with loader net.minecraftforge.client.model.obj.OBJLoader@eefc1bf, skipping
net.minecraftforge.client.model.obj.OBJModel$UVsOutOfBoundsException: Model 'valkyrianwarfare:models/block/pi.obj' has UVs ('vt') out of bounds 0-1! The missing model will be used instead. Support for UV processing will be added to the OBJ loader in the future.
at net.minecraftforge.client.model.obj.OBJModel$Parser.parse(OBJModel.java:254) ~[OBJModel$Parser.class:?]
at net.minecraftforge.client.model.obj.OBJLoader.loadModel(OBJLoader.java:72) ~[OBJLoader.class:?]
at net.minecraftforge.client.model.ModelLoaderRegistry.getModel(ModelLoaderRegistry.java:123) [ModelLoaderRegistry.class:?]
at net.minecraftforge.client.model.ModelLoader.loadAnyModel(ModelLoader.java:388) [ModelLoader.class:?]
at net.minecraftforge.client.model.ModelLoader.getModel(ModelLoader.java:369) [ModelLoader.class:?]
at net.minecraftforge.client.model.ModelLoader$WeightedRandomModel.<init>(ModelLoader.java:747) [ModelLoader$WeightedRandomModel.class:?]
at net.minecraftforge.client.model.ModelLoader.registerVariant(ModelLoader.java:196) [ModelLoader.class:?]
at net.minecraft.client.resources.model.ModelBakery.loadVariants(ModelBakery.java:113) [ModelBakery.class:?]
at net.minecraftforge.client.model.ModelLoader.loadBlocks(ModelLoader.java:174) [ModelLoader.class:?]
at net.minecraftforge.client.model.ModelLoader.setupModelRegistry(ModelLoader.java:119) [ModelLoader.class:?]
at net.minecraft.client.resources.model.ModelManager.onResourceManagerReload(ModelManager.java:28) [ModelManager.class:?]
at net.minecraft.client.resources.SimpleReloadableResourceManager.registerReloadListener(SimpleReloadableResourceManager.java:120) [simpleReloadableResourceManager.class:?]
at net.minecraft.client.Minecraft.startGame(Minecraft.java:515) [Minecraft.class:?]
at net.minecraft.client.Minecraft.run(Minecraft.java:360) [Minecraft.class:?]
at net.minecraft.client.main.Main.main(Main.java:116) [Main.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_73]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_73]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_73]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_73]
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_73]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_73]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_73]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_73]
at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97) [start/:?]
at GradleStart.main(GradleStart.java:26) [start/:?]
[15:04:09] [Client thread/INFO] [FML]: Max texture size: 16384
[15:04:09] [Client thread/INFO]: Created: 16x16 textures-atlas

 

 

How do I fix this?

You need to fix your obj's UVs

And how do I do that? I already made the models using sketchup; is there a way I could import them in a different modeling program to fix it?

 

(Edit): Also, how would I fix it?

 

Sketchup is terrible at assigning UVs.

 

Try

http://www.geeks3d.com/20090303/lithunwrap-free-uv-mapper-for-windows/

 

(You will have to zoom out a lot in order to see the polys)