Hi,
I'd like to migrate an existing Flex project from Adobe 4.6.1 to the latest 
Apache release.
After switching to SDK 4.9.1 or 4.10.0 following error message is thrown by my 
FlashBuilder 4.7:
"An internal build error has occurred. See the error log for more information".

Is there anything essential that I have to do by switching the SDK?

Thanks for help!
Olaf

This is an extract from the error log:
=====================================================================================================================
!ENTRY com.adobe.flexbuilder.project 4 43 2013-07-29 14:23:47.506
!MESSAGE Uncaught exception in compiler
!STACK 0
java.lang.NullPointerException
        at flex2.compiler.CompilerAPI.getMessagingClasses(CompilerAPI.java:1730)
        at flex2.compiler.CompilerAPI.compile(CompilerAPI.java:1538)
        at flex2.tools.oem.Application.compile(Application.java:1357)
        at flex2.tools.oem.Application.recompile(Application.java:1295)
        at flex2.tools.oem.Application.compile(Application.java:894)
        at 
flex2.tools.flexbuilder.BuilderApplication.compile(BuilderApplication.java:367)
        at 
com.adobe.flexbuilder.multisdk.compiler.internal.ASApplicationBuilder$MyBuilder.mybuild(ASApplicationBuilder.java:309)
        at 
com.adobe.flexbuilder.multisdk.compiler.internal.ASApplicationBuilder.build(ASApplicationBuilder.java:128)
        at 
com.adobe.flexbuilder.multisdk.compiler.internal.ASBuilder.build(ASBuilder.java:203)
        at 
com.adobe.flexbuilder.multisdk.compiler.internal.ASItemBuilder.build(ASItemBuilder.java:93)
        at 
com.adobe.flexbuilder.project.compiler.internal.FlexProjectBuilder.buildItem(FlexProjectBuilder.java:708)
        at 
com.adobe.flexbuilder.project.compiler.internal.FlexProjectBuilder.build(FlexProjectBuilder.java:412)
        at 
com.adobe.flexbuilder.project.compiler.internal.FlexIncrementalBuilder.build(FlexIncrementalBuilder.java:171)
        at 
org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:728)
        at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
        at 
org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199)
        at 
org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:239)
        at 
org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:292)
        at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
        at 
org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:295)
        at 
org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:351)
        at 
org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:374)
        at 
org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:143)
        at 
org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:241)
        at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
=====================================================================================================================

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