miscellaneous errors in to STDOUT of start_xwiki.sh script during use.

root@ojuelaite:/Local/Ix86/Linux/xwiki-1.0-beta-4# ./start_xwiki.sh
10:51:26.149 INFO [main] org.mortbay.log.LogImpl.add(LogImpl.java:109) >16> added org.mortbay.log.OutputStreamLogSink@1ffbd68
10:51:26.125 INFO [main] org.mortbay.util.FileResource.<clinit>(FileResource.java:60) >11> Checking Resource aliases
10:51:26.323 INFO [main] org.mortbay.http.HttpServer.doStart(HttpServer.java:729) >10> Version Jetty/5.1.5
10:51:26.330 INFO [main] org.mortbay.util.Container.start(Container.java:74) >14> Started org.mortbay.jetty.servlet.ServletHandler@1f934ad
10:51:26.331 INFO [main] org.mortbay.util.Container.start(Container.java:74) >11> Started ServletHttpContext[/,/]
10:51:26.333 INFO [main] org.mortbay.http.SocketListener.start(SocketListener.java:204) >11> Started SocketListener on 127.0.0.1:8081
10:51:26.333 INFO [main] org.mortbay.util.Container.start(Container.java:74) >09> Started org.mortbay.jetty.Server@1cd8669
10:51:26.394 INFO [main] org.mortbay.http.HttpServer.setStatsOn(HttpServer.java:1133) >18> Statistics on = false for org.mortbay.jetty.Server@691f36
10:51:26.395 INFO [main] org.mortbay.http.HttpServer.doStart(HttpServer.java:729) >10> Version Jetty/5.1.5
10:51:26.767 INFO [main] org.mortbay.util.Container.start(Container.java:74) >15> Started org.mortbay.jetty.servlet.WebApplicationHandler@1e152c5
10:51:27.884 INFO [main] org.mortbay.util.Container.start(Container.java:74) >11> Started WebApplicationContext[/xwiki,xwiki]
10:51:27.888 INFO [main] org.mortbay.http.SocketListener.start(SocketListener.java:204) >11> Started SocketListener on 0.0.0.0:8301
10:51:27.889 INFO [main] org.mortbay.util.Container.start(Container.java:74) >09> Started org.mortbay.jetty.Server@691f36

Then on viewing main page "http://localhost:8301/xwiki/bin/view/Main/WebHome"

10:51:49,216 ERROR P1-19 http://localhost:8301/xwiki/bin/view/Main/WebHome SimpleLog4JLogSystem:logVelocityMessage:143 - RHS of #set statement is null. Context will not be modified. [line 9, column 1]
10:51:49,243 ERROR P1-19 http://localhost:8301/xwiki/bin/view/Main/WebHome SimpleLog4JLogSystem:logVelocityMessage:143 - Left side ($objuser.getProperty("usertype").value) of '==' operation has null value. If a reference, it may not be in the context. Operation not possible. [line 10, column 66]
10:51:49,245 WARN P1-19 http://localhost:8301/xwiki/bin/view/Main/WebHome SimpleLog4JLogSystem:logVelocityMessage:134 - org.apache.velocity.runtime.exception.ReferenceException: reference : template = [line 1,column 31] : ${doc.parent.title} is not a valid reference.
10:51:49,277 ERROR P1-19 http://localhost:8301/xwiki/bin/view/Main/WebHome SimpleLog4JLogSystem:logVelocityMessage:143 - RHS of #set statement is null. Context will not be modified. [line 1, column 1]
10:51:49,321 ERROR P1-19 http://localhost:8301/xwiki/bin/view/Main/WebHome SimpleLog4JLogSystem:logVelocityMessage:143 - RHS of #set statement is null. Context will not be modified. [line 18, column 1]
10:51:49,325 ERROR P1-19 http://localhost:8301/xwiki/bin/view/Main/WebHome SimpleLog4JLogSystem:logVelocityMessage:143 - VM #breadcrumb: error : too few arguments to macro. Wanted 3 got 0
10:51:49,365 ERROR P1-19 http://localhost:8301/xwiki/bin/view/Main/WebHome SimpleLog4JLogSystem:logVelocityMessage:143 - Left side ($!hidecolumns) of '==' operation has null value. If a reference, it may not be in the context. Operation not possible. [line 9, column 21]
10:51:49,366 ERROR P1-19 http://localhost:8301/xwiki/bin/view/Main/WebHome SimpleLog4JLogSystem:logVelocityMessage:143 - RHS of #set statement is null. Context will not be modified. [line 11, column 1]
10:51:49,429 ERROR P1-19 http://localhost:8301/xwiki/bin/view/Main/WebHome SimpleLog4JLogSystem:logVelocityMessage:143 - Left side ($category) of '==' operation has null value. If a reference, it may not be in the context. Operation not possible. Main.WebHome [line 5, column 16]
10:51:49,431 WARN P1-19 http://localhost:8301/xwiki/bin/view/Main/WebHome SimpleLog4JLogSystem:logVelocityMessage:134 - org.apache.velocity.runtime.exception.ReferenceException: reference : template = Main.WebHome [line 1,column 242] : ${category} is not a valid reference.
10:51:49,467 ERROR P1-19 http://localhost:8301/xwiki/bin/view/Main/WebHome SimpleLog4JLogSystem:logVelocityMessage:143 - Left side ($velocityCount) of '==' operation has null value. If a reference, it may not be in the context. Operation not possible. Main.WebHome [line 48, column 42]
10:51:49,577 ERROR P1-19 http://localhost:8301/xwiki/bin/view/Main/WebHome SimpleLog4JLogSystem:logVelocityMessage:143 - RHS of #set statement is null. Context will not be modified. Main.WebHome [line 7, column 1]
10:51:49,917 ERROR P1-19 http://localhost:8301/xwiki/bin/view/Main/WebHome SimpleLog4JLogSystem:logVelocityMessage:143 - RHS of #set statement is null. Context will not be modified. [line 7, column 1]
10:51:50,432 WARN P1-19 http://localhost:8301/xwiki/bin/view/Main/WebHome MonitorData:log:183 - MONITOR Main.WebHome: 1705ms
10:51:51.325 INFO [P1-19] org.mortbay.util.Container.start(Container.java:74) >08> Started HttpContext[/,/]