Minecraft Forums

Whenever I try to load up an older version of minecraft, my game always crashes on startup. Any help?

Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem.

If you wish to report this, please copy this entire text and email it to [email protected]
Please include a description of what you did when the error occured.

--- BEGIN ERROR REPORT a1dce528 --------
Generated 1/8/17 7:52 PM

Minecraft: Minecraft 1.1
OS: Windows 10 (amd64) version 10.0
Java: 1.8.0_25, Oracle Corporation
VM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
LWJGL: 2.9.0
OpenGL: GeForce GTX 660/PCIe/SSE2 version 4.5.0 NVIDIA 376.09, NVIDIA Corporation

java.lang.NullPointerException
at java.io.Reader.<init>(Reader.java:78)
at java.io.InputStreamReader.<init>(InputStreamReader.java:97)
at abn.a(SourceFile:62)
at abn.a(SourceFile:99)
at net.minecraft.client.Minecraft.a(SourceFile:254)
at net.minecraft.client.Minecraft.run(SourceFile:648)
at java.lang.Thread.run(Thread.java:745)
--- END ERROR REPORT 8d792939 ----------

Thanks! Reinstalling helped!