Exception after compile/browse

[Dmitry Dulepov]

Shell shows:
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[WARN] StandardWrapperValve[shell]: Servlet.service() for servlet shell
threw exception
java.lang.IllegalArgumentException: null
at
com.google.gwt.dev.shell.GWTShellServlet.isNotModified(GWTShellServlet.java:456)
at
com.google.gwt.dev.shell.GWTShellServlet.doGetPublicFile(GWTShellServlet.java:363)
at
com.google.gwt.dev.shell.GWTShellServlet.processFileRequest(GWTShellServlet.java:221)
at
com.google.gwt.dev.shell.GWTShellServlet.doGet(GWTShellServlet.java:238)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at
com.google.gwt.dev.shell.GWTShellServlet.service(GWTShellServlet.java:67)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
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What does this mean?