Error

--- BEGIN ERROR REPORT 7ee158a --------
Generated 2/29/12 4:12 PM

Minecraft: Minecraft 1.1
OS: Windows 7 (amd64) version 6.1
Java: 1.7.0, Oracle Corporation
VM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
LWJGL: 2.4.2
OpenGL: ATI Radeon HD 5800 Series version 4.2.11399 Compatibility Profile Context, ATI Technologies Inc.

java.lang.NoSuchMethodException: rocketScience.ParachuteEntity.<init>(vq, double, double, double)
	at java.lang.Class.getConstructor0(Unknown Source)
	at java.lang.Class.getConstructor(Unknown Source)
	at abm.a(NetClientHandler.java:189)
	at mt.a(SourceFile:94)
	at kp.b(NetworkManager.java:227)
	at abm.b(NetClientHandler.java:48)
	at iq.c(SourceFile:57)
	at net.minecraft.client.Minecraft.k(SourceFile:1598)
	at net.minecraft.client.Minecraft.x(SourceFile:709)
	at net.minecraft.client.Minecraft.run(SourceFile:662)
	at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 7d066e1d ----------