Java error causing crashes

[Amstel]

Title: Java error causing crashes

Version: 3.1.2

OS: Windows 7 64Bit Professional

Java Version: Version 7 Build 1.7.0_01-b08

Description of Problem:

Have had a server running on my home pc for about 3 weeks without any issues or errors. Had shut the server down on Friday and started it up Sunday. Maybe an hour later I recieved the java.lang.NullPointerException error in the prompt window and I was disconnected on my client and those who were on. It has since happened at least a dozen times. I have tried redownloading the client, the server files and deleting the tekkit jar files to have it downoad everything again. So far nothing has helped.

Occasionally I get a overflow error on my client prior to the server crashing.

Error Messages:

Error Log:

[sEVERE] java.lang.NullPointerException

2012-09-10 18:52:40 [sEVERE] 	at codechicken.wirelessredstone.core.RedstoneEtherFrequency.putActiveTransmittersInList(RedstoneEtherFrequency.java:383)

2012-09-10 18:52:40 [sEVERE] 	at codechicken.wirelessredstone.core.RedstoneEther.getActiveTransmitters(RedstoneEther.java:1208)

2012-09-10 18:52:40 [sEVERE] 	at codechicken.wirelessredstone.addons.RedstoneEtherAddonManager.processSMPMaps(RedstoneEtherAddonManager.java:143)

2012-09-10 18:52:40 [sEVERE] 	at codechicken.wirelessredstone.addons.RedstoneEtherAddonManager.onTick(RedstoneEtherAddonManager.java:564)

2012-09-10 18:52:40 [sEVERE] 	at net.minecraft.server.mod_WirelessRedstoneAddons.onTickInGame(mod_WirelessRedstoneAddons.java:41)

2012-09-10 18:52:40 [sEVERE] 	at net.minecraft.server.BaseMod.doTickInGame(BaseMod.java:34)

2012-09-10 18:52:40 [sEVERE] 	at cpw.mods.fml.common.modloader.BaseModTicker.sendTick(BaseModTicker.java:95)

2012-09-10 18:52:40 [sEVERE] 	at cpw.mods.fml.common.modloader.BaseModTicker.tickBaseMod(BaseModTicker.java:83)

2012-09-10 18:52:40 [sEVERE] 	at cpw.mods.fml.common.modloader.BaseModTicker.tickEnd(BaseModTicker.java:55)

2012-09-10 18:52:40 [sEVERE] 	at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:22)

2012-09-10 18:52:40 [sEVERE] 	at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:185)

2012-09-10 18:52:40 [sEVERE] 	at cpw.mods.fml.server.FMLBukkitHandler.onServerPostTick(FMLBukkitHandler.java:631)

2012-09-10 18:52:40 [sEVERE] 	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:607)

2012-09-10 18:52:40 [sEVERE] 	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:467)

2012-09-10 18:52:40 [sEVERE] 	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

2012-09-10 18:52:40 [sEVERE] Unexpected exception

java.lang.NullPointerException

	at codechicken.wirelessredstone.core.RedstoneEtherFrequency.putActiveTransmittersInList(RedstoneEtherFrequency.java:383)

	at codechicken.wirelessredstone.core.RedstoneEther.getActiveTransmitters(RedstoneEther.java:1208)

	at codechicken.wirelessredstone.addons.RedstoneEtherAddonManager.processSMPMaps(RedstoneEtherAddonManager.java:143)

	at codechicken.wirelessredstone.addons.RedstoneEtherAddonManager.onTick(RedstoneEtherAddonManager.java:564)

	at net.minecraft.server.mod_WirelessRedstoneAddons.onTickInGame(mod_WirelessRedstoneAddons.java:41)

	at net.minecraft.server.BaseMod.doTickInGame(BaseMod.java:34)

	at cpw.mods.fml.common.modloader.BaseModTicker.sendTick(BaseModTicker.java:95)

	at cpw.mods.fml.common.modloader.BaseModTicker.tickBaseMod(BaseModTicker.java:83)

	at cpw.mods.fml.common.modloader.BaseModTicker.tickEnd(BaseModTicker.java:55)

	at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:22)

	at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:185)

	at cpw.mods.fml.server.FMLBukkitHandler.onServerPostTick(FMLBukkitHandler.java:631)

	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:607)

	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:467)

	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)