PNGs breaking the build on Linux (GWT 2.1.0)

Hi,
I've got a GWT 2.1 project that has some transparent 8-bit PNGs as
resources. I'm developing on Mac OS X Snow Leopard, and building/
packaging my project (with Maven) works fine. But when I upload it to
our TeamCity CI box (Linux, Ubuntu 9.01) with the same pom.xml, same
local Maven repo, etc., I get the following error on build (see
below). It's complaining about some PNGs that have the following
attributes (from ImageMagick 'identify' command):

filter-att.png PNG 25x50 25x50+0+0 8-bit DirectClass 2.74KiB 0.000u
0:00.000

Any ideas? Is there an OS incompatibility or is there a GWT library
that I might be missing? Both versions of GWT are the same (2.1.0).

[ERROR] Unrecognized image file format
[INFO] [ERROR] Generator
'com.google.gwt.resources.rebind.context.InlineClientBundleGenerator'
threw an exception while rebinding
'com.peek.qcom.war.client.FilterBarViewImpl_BinderImpl_GenBundle'
java.lang.NullPointerException
at com.google.gwt.resources.rg.ImageResourceGenerator
$BundledImage.addImage(ImageResourceGenerator.java:97)
at
com.google.gwt.resources.rg.ImageResourceGenerator.prepare(ImageResourceGenerator.java:
542)
at
com.google.gwt.resources.rebind.context.AbstractClientBundleGenerator.initAndPrepare(AbstractClientBundleGenerator.java:
628)
at
com.google.gwt.resources.rebind.context.AbstractClientBundleGenerator.initAndPrepare(AbstractClientBundleGenerator.java:
654)
at
com.google.gwt.resources.rebind.context.AbstractClientBundleGenerator.generate(AbstractClientBundleGenerator.java:
243)
at
com.google.gwt.dev.javac.StandardGeneratorContext.runGenerator(StandardGeneratorContext.java:
427)
at
com.google.gwt.dev.cfg.RuleGenerateWith.realize(RuleGenerateWith.java:
39)
at com.google.gwt.dev.shell.StandardRebindOracle
$Rebinder.tryRebind(StandardRebindOracle.java:115)
at com.google.gwt.dev.shell.StandardRebindOracle
$Rebinder.rebind(StandardRebindOracle.java:58)
at
com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:
161)
at
com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:
150)
at com.google.gwt.dev.Precompile
$DistillerRebindPermutationOracle.getAllPossibleRebindAnswers(Precompile.java:
345)
at
com.google.gwt.dev.jdt.WebModeCompilerFrontEnd.doFindAdditionalTypesUsingRebinds(WebModeCompilerFrontEnd.java:
106)
at com.google.gwt.dev.jdt.AbstractCompiler$Sandbox
$CompilerImpl.process(AbstractCompiler.java:254)
at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:
444)
at com.google.gwt.dev.jdt.AbstractCompiler$Sandbox
$CompilerImpl.compile(AbstractCompiler.java:175)
at com.google.gwt.dev.jdt.AbstractCompiler$Sandbox
$CompilerImpl.compile(AbstractCompiler.java:288)
at com.google.gwt.dev.jdt.AbstractCompiler$Sandbox$CompilerImpl.access
$400(AbstractCompiler.java:145)
at
com.google.gwt.dev.jdt.AbstractCompiler.compile(AbstractCompiler.java:
632)
at
com.google.gwt.dev.jdt.BasicWebModeCompiler.getCompilationUnitDeclarations(BasicWebModeCompiler.java:
124)
at
com.google.gwt.dev.jdt.WebModeCompilerFrontEnd.getCompilationUnitDeclarations(WebModeCompilerFrontEnd.java:
54)
at
com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java:
484)
at
com.google.gwt.dev.jjs.JavaScriptCompiler.precompile(JavaScriptCompiler.java:
32)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:545)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:466)
at com.google.gwt.dev.Compiler.run(Compiler.java:205)
at com.google.gwt.dev.Compiler.run(Compiler.java:177)
at com.google.gwt.dev.Compiler$1.run(Compiler.java:149)
at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:
87)
at
com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:
81)
at com.google.gwt.dev.Compiler.main(Compiler.java:156)

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