incubator compile error

Hi all,
I apologies in advance if this forum is not intended for questions
related to incubator, but I could not find anywhere better.
I followed the instruction on
http://code.google.com/docreader/#p=google-web-toolkit-incubator&s=google-web-toolkit-incubator&t=MakingIncubatorBetter
and I get this error:
--(1736:Fri,24 Sep 10:$)-- ant -Dget.home=/Users/arash/Documents/
gwt-2.0.4/ test
Buildfile: build.xml

clean.test.results:
[echo] cleaning all test results

checksetup:
[echo] gwt.home = /Users/arash/Documents/gwt-2.0.4/
[echo] gwt.tools = /Users/arash/Documents/workspace/gwt-tools/
[echo] gwt.platform = mac

compile:
[mkdir] Created dir: /Users/arash/Documents/workspace/google-
incubator/trunk-read-only/build/bin
[echo] Compiling source...
[gwt.javac] Compiling 560 source files to /Users/arash/Documents/
workspace/google-incubator/trunk-read-only/build/bin
[gwt.javac] /Users/arash/Documents/workspace/google-incubator/trunk-
read-only/src/com/google/gwt/libideas/resources/tools/MakeBundle.java:
262: refresh(com.google.gwt.core.ext.TreeLogger) in
com.google.gwt.dev.resource.impl.ResourceOracleImpl cannot be applied
to
(com.google.gwt.core.ext.TreeLogger,com.google.gwt.dev.resource.impl.ResourceOracleImpl)
[gwt.javac] ResourceOracleImpl.refresh(logger, oracle);
[gwt.javac] ^
[gwt.javac] Note: Some input files use or override a deprecated API.
[gwt.javac] Note: Recompile with -Xlint:deprecation for details.
[gwt.javac] Note: Some input files use unchecked or unsafe operations.
[gwt.javac] Note: Recompile with -Xlint:unchecked for details.
[gwt.javac] 1 error

BUILD FAILED
/Users/arash/Documents/workspace/google-incubator/trunk-read-only/
build.xml:282: Compile failed; see the compiler error output for
details.

Total time: 7 seconds

could you please guide me.
thanks

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