Code: 2011-05-06 07:58:09 [SEVERE] java.lang.NullPointerException 2011-05-06 07:58:09 [SEVERE] at net.minecraft.server.NetworkManager.f(NetworkManager.java:127) 2011-05-06 07:58:09 [SEVERE] at net.minecraft.server.NetworkManager.c(NetworkManager.java:226) 2011-05-06 07:58:09 [SEVERE] at net.minecraft.server.NetworkReaderThread.run(SourceFile:69) I can get anywhere between 1-5 of these errors when I start up the server/reload the plugins. I have a feeling that it's one of the plugins, but I can't pinpoint which one.
I would suggest disabling half of the plugins and seeing if it still happens. Then try the other half. That will tell you if it is a plugin and which half contains it. Repeat until you have narrowed it down to 1. Also, you could try running without plugins to see if it is a plugin.