Tekkit crashes after short time on MP server

[dyl421421]

Title: Tekkit crashes after short time on MP server

Version: 2.1.1

OS: Windows 7 Professional 64 bit

Java Version: Java 7

Description of Problem:

Every time I join any server with tekkit, my games crashes and I have to relog. It says something about worldrenderer.java:600 every time.

Please help! I can't even play on a server without crashing and I love to play tekkit.

Error Messages:

Error Log:

[WARNING] Received a TileEntityData packet for a location that did not have a TileEntity: (-722, 40, 880) 1: 59, 0, 0

2012-06-30 12:13:18 [sEVERE] A critical error has occurred.

java.lang.NullPointerException

	at ct.a(WorldRenderer.java:200)

	at l.a(RenderGlobal.java:1482)

	at lr.a(EntityRenderer.java:1070)

	at lr.b(EntityRenderer.java:907)

	at net.minecraft.client.Minecraft.x(Minecraft.java:873)

	at net.minecraft.client.Minecraft.run(Minecraft.java:750)

	at java.lang.Thread.run(Unknown Source)