Caught Error Stitching: java.lang.NullPointerException

I loaded the attached blockstate file and this happened:

[11:10:37] [Client thread/INFO]: SoundSystem shutting down...
[11:10:37] [Client thread/WARN]: Author: Paul Lamb, www.paulscode.com
[11:10:37] [Sound Library Loader/INFO]: Starting up SoundSystem...
[11:10:37] [Thread-41/INFO]: Initializing LWJGL OpenAL
[11:10:37] [Thread-41/INFO]: (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
[11:10:37] [Thread-41/INFO]: OpenAL initialized.
[11:10:38] [Sound Library Loader/INFO]: Sound engine started
[11:10:38] [Client thread/INFO]: Caught error stitching, removing all assigned resourcepacks
java.lang.NullPointerException
	at bst.a(SourceFile:283) ~[15w32c.jar:?]
	at bst.e(SourceFile:276) ~[15w32c.jar:?]
	at bst.c(SourceFile:217) ~[15w32c.jar:?]
	at bst.a(SourceFile:147) ~[15w32c.jar:?]
	at bsu.a(SourceFile:23) ~[15w32c.jar:?]
	at brn.c(SourceFile:104) ~[15w32c.jar:?]
	at brn.a(SourceFile:92) ~[15w32c.jar:?]
	at ayh.e(SourceFile:639) [15w32c.jar:?]
	at ayh.s(SourceFile:1686) [15w32c.jar:?]
	at ayh.at(SourceFile:874) [15w32c.jar:?]
	at ayh.a(SourceFile:323) [15w32c.jar:?]
	at net.minecraft.client.main.Main.main(SourceFile:125) [15w32c.jar:?]
[11:10:38] [Client thread/INFO]: Reloading ResourceManager: Default
[11:10:38] [Client thread/INFO]: SoundSystem shutting down...
[11:10:38] [Client thread/WARN]: Author: Paul Lamb, www.paulscode.com
[11:10:38] [Sound Library Loader/INFO]: Starting up SoundSystem...
[11:10:38] [Thread-43/INFO]: Initializing LWJGL OpenAL
[11:10:38] [Thread-43/INFO]: (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
[11:10:38] [Thread-43/INFO]: OpenAL initialized.
[11:10:39] [Sound Library Loader/INFO]: Sound engine started
[11:10:39] [Client thread/INFO]: Created: 512x512 textures-atlas