Flex Builder 4 / Flex 4 issues!!

Posted the same in the Folder 'Flex', ...(received no replies though.. ..so posting here)
Project built on Flex 3 was migrated to Flex 4. Now, every time the Project is built, the 'Building workspace' turns up and the continues upto 27% and then the IDE hangs.(this % value sometimes increases to 47%)..
Now, the same project, when built on Flex3, builds super quick.
I am running Flash builder 4 on Windows XP,SP3, 2GB RAM,AMD Athlon Dual Core processer (if this helps..   )
Should i upgrade the machine??
Should i change any settings in the IDE?
Please advice!

Here are the errors I get in my .log folder
!ENTRY CodeModel 2 1 2010-07-20 13:36:02.149
!MESSAGE Could not get comment
!STACK 0
java.io.StreamCorruptedException: invalid stream header: 0003332E
    at java.io.ObjectInputStream.readStreamHeader(Unknown Source)
    at java.io.ObjectInputStream.<init>(Unknown Source)
    at com.adobe.flexbuilder.codemodel.internal.indices.ASDocCommentIndex.getComment(ASDocCommen tIndex.java:408)
    at com.adobe.flexbuilder.codemodel.internal.asdoc.SWCCommentRef.resolveSWCComment(SWCComment Ref.java:114)
    at com.adobe.flexbuilder.codemodel.internal.asdoc.SWCCommentRef.resolveDecoratedDefinition(S WCCommentRef.java:166)
    at com.adobe.flexide.as.core.asdoc.ASDocCommentBuilder.getASDocText(ASDocCommentBuilder.java :133)
    at com.adobe.flexide.as.core.asdoc.ASDocInput.<init>(ASDocInput.java:41)
    at com.adobe.flexide.as.core.asdoc.ASDocInputFactory.build(ASDocInputFactory.java:65)
    at com.adobe.flexide.as.core.ActionScriptInfoHover.getHoverInfo2(ActionScriptInfoHover.java: 100)
    at com.adobe.flexide.as.core.TextHoverChooser.getActiveHover(TextHoverChooser.java:76)
    at com.adobe.flexide.as.core.TextHoverChooser.getHoverInfo2(TextHoverChooser.java:121)
    at org.eclipse.jface.text.TextViewerHoverManager$4.run(TextViewerHoverManager.java:166)
!ENTRY org.eclipse.ui 4 0 2010-07-20 14:10:12.667
!MESSAGE Warning: Detected recursive attempt by part com.adobe.flexbuilder.editors.mxml.MXMLEditor to create itself (this is probably, but not necessarily, a bug)
!STACK 1
org.eclipse.ui.PartInitException: Warning: Detected recursive attempt by part com.adobe.flexbuilder.editors.mxml.MXMLEditor to create itself (this is probably, but not necessarily, a bug)
    at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:586)
    at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:286)
    at org.eclipse.ui.internal.EditorManager.findEditor(EditorManager.java:403)
    at org.eclipse.ui.internal.EditorManager.findEditor(EditorManager.java:381)
    at org.eclipse.ui.internal.WorkbenchPage.findEditor(WorkbenchPage.java:2096)
    at org.eclipse.ui.ide.ResourceUtil.findEditor(ResourceUtil.java:97)
    at org.eclipse.ui.views.navigator.ResourceNavigator.linkToEditor(ResourceNavigator.java:1013 )
    at org.eclipse.ui.views.navigator.ResourceNavigator$7.run(ResourceNavigator.java:491)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3855)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3476)
    at org.eclipse.jface.operation.ModalContext$ModalContextThread.block(ModalContext.java:173)
    at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:388)
    at org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:507)
    at com.adobe.flexide.editorcore.loadservice.CodeModelProjectLoadDialog.runLoadProject(CodeMo delProjectLoadDialog.java:188)
    at com.adobe.flexide.editorcore.loadservice.DefaultCMLoadService.loadProject(DefaultCMLoadSe rvice.java:52)
    at com.adobe.flexide.editorcore.loadservice.DefaultCMLoadService.loadProject(DefaultCMLoadSe rvice.java:71)
    at com.adobe.flexide.editorcore.editor.AbstractFlexDocumentProvider.connect(AbstractFlexDocu mentProvider.java:106)
    at com.adobe.flexbuilder.mxml.editor.code.MXMLDocumentProvider.connect(MXMLDocumentProvider. java:65)
    at org.eclipse.ui.texteditor.AbstractTextEditor.doSetInput(AbstractTextEditor.java:4134)
    at org.eclipse.ui.texteditor.StatusTextEditor.doSetInput(StatusTextEditor.java:203)
    at org.eclipse.ui.texteditor.AbstractDecoratedTextEditor.doSetInput(AbstractDecoratedTextEdi tor.java:1413)
    at org.eclipse.ui.editors.text.TextEditor.doSetInput(TextEditor.java:166)
    at com.adobe.flexide.editorcore.editor.AbstractFlexEditor.doSetInput(AbstractFlexEditor.java :1422)
    at org.eclipse.ui.texteditor.AbstractTextEditor$19.run(AbstractTextEditor.java:3115)
    at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:464)
    at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:372)
    at org.eclipse.jface.window.ApplicationWindow$1.run(ApplicationWindow.java:759)
    at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
    at org.eclipse.jface.window.ApplicationWindow.run(ApplicationWindow.java:756)
    at org.eclipse.ui.internal.WorkbenchWindow.run(WorkbenchWindow.java:2579)
    at org.eclipse.ui.texteditor.AbstractTextEditor.internalInit(AbstractTextEditor.java:3133)
    at org.eclipse.ui.texteditor.AbstractTextEditor.init(AbstractTextEditor.java:3160)
    at com.adobe.flexide.editorcore.editor.AbstractFlexEditor.init(AbstractFlexEditor.java:452)
    at com.adobe.flexide.mxml.core.editor.MXMLCoreEditor.init(MXMLCoreEditor.java:75)
    at org.eclipse.ui.part.MultiPageEditorPart.addPage(MultiPageEditorPart.java:238)
    at org.eclipse.ui.part.MultiPageEditorPart.addPage(MultiPageEditorPart.java:212)
    at com.adobe.flexbuilder.editorcore.editor.CodeAndDesignEditor.createPages(CodeAndDesignEdit or.java:209)
    at com.adobe.flexbuilder.mxml.editor.MXMLEditor.createPages(MXMLEditor.java:217)
    at org.eclipse.ui.part.MultiPageEditorPart.createPartControl(MultiPageEditorPart.java:357)
    at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:662)
    at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:462)
    at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
    at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:286)
    at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2857)
    at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2762)
    at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2754)
    at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2705)
    at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
    at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2701)
    at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2685)
    at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2676)
    at org.eclipse.ui.ide.IDE.openEditor(IDE.java:651)
    at org.eclipse.ui.ide.IDE.openEditor(IDE.java:610)
    at org.eclipse.ui.actions.OpenFileAction.openFile(OpenFileAction.java:99)
    at org.eclipse.ui.actions.OpenSystemEditorAction.run(OpenSystemEditorAction.java:99)
    at org.eclipse.ui.views.navigator.OpenActionGroup.runDefaultAction(OpenActionGroup.java:133)
    at com.adobe.flexbuilder.editors.derived.ui.navigator.FlexMainActionGroup.runDefaultAction(F lexMainActionGroup.java:350)
    at org.eclipse.ui.views.navigator.ResourceNavigator.handleOpen(ResourceNavigator.java:787)
    at org.eclipse.ui.views.navigator.ResourceNavigator$6.open(ResourceNavigator.java:499)
    at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.open(OpenAndLinkWithEditorHel per.java:48)
    at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:842)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.core.runtime.Platform.run(Platform.java:888)
    at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)
    at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
    at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:840)
    at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1101)
    at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1205)
    at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:264)
    at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:258)
    at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:298)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3880)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3473)
    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
    at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at com.adobe.flexbuilder.standalone.FlexBuilderApplication.start(FlexBuilderApplication.java :109)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLau ncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.jav a:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1311)
And it crashes often with this
!ENTRY org.eclipse.core.jobs 4 2 2010-07-22 00:15:43.236
!MESSAGE An internal error occurred during: "Build Project".
!STACK 0
java.lang.OutOfMemoryError: Java heap space
    at java.util.Arrays.copyOf(Unknown Source)
    at java.util.Arrays.copyOf(Unknown Source)
    at java.util.ArrayList.ensureCapacity(Unknown Source)
    at java.util.ArrayList.add(Unknown Source)
    at flash.swf.TagDecoder.decodeShapeRecords(TagDecoder.java:2580)
    at flash.swf.TagDecoder.decodeGlyph(TagDecoder.java:2541)
    at flash.swf.TagDecoder.decodeDefineFont2And3(TagDecoder.java:813)
    at flash.swf.TagDecoder.decodeDefineFont3(TagDecoder.java:754)
    at flash.swf.TagDecoder.decodeTag(TagDecoder.java:329)
    at flash.swf.TagDecoder.decodeTags(TagDecoder.java:183)
    at flash.swf.TagDecoder.parse(TagDecoder.java:131)
    at flex2.compiler.PersistenceStore.readAssets(PersistenceStore.java:1918)
    at flex2.compiler.PersistenceStore.readCompilationUnit(PersistenceStore.java:1856)
    at flex2.compiler.PersistenceStore.readCompilationUnits(PersistenceStore.java:1541)
    at flex2.compiler.PersistenceStore.read(PersistenceStore.java:958)
    at flex2.compiler.CompilerAPI.loadCompilationUnits(CompilerAPI.java:4844)
    at flex2.compiler.CompilerAPI.loadCompilationUnits(CompilerAPI.java:4823)
    at flex2.tools.oem.Application.loadCompilationUnits(Application.java:706)
    at flex2.tools.oem.Application.recompile(Application.java:1071)
    at flex2.tools.oem.Application.compile(Application.java:819)
    at flex2.tools.flexbuilder.BuilderApplication.compile(BuilderApplication.java:344)
    at com.adobe.flexbuilder.multisdk.compiler.internal.ASApplicationBuilder$MyBuilder.mybuild(A SApplicationBuilder.java:276)
    at com.adobe.flexbuilder.multisdk.compiler.internal.ASApplicationBuilder.build(ASApplication Builder.java:127)
    at com.adobe.flexbuilder.multisdk.compiler.internal.ASBuilder.build(ASBuilder.java:190)
    at com.adobe.flexbuilder.multisdk.compiler.internal.ASItemBuilder.build(ASItemBuilder.java:7 4)
    at com.adobe.flexbuilder.project.compiler.internal.FlexProjectBuilder.buildItem(FlexProjectB uilder.java:480)
    at com.adobe.flexbuilder.project.compiler.internal.FlexProjectBuilder.build(FlexProjectBuild er.java:306)
    at com.adobe.flexbuilder.project.compiler.internal.FlexIncrementalBuilder.build(FlexIncremen talBuilder.java:157)
    at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:627)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:170)
    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:201)
Here the session settings
eclipse.buildId=unknown
java.version=1.6.0_16
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_US
Command-line arguments:  -os win32 -ws win32 -arch x86
Pls help us.
Also often we get compilation errors indicating methods which are available, as not found. We are not sure how to overcome this as well. Pls advice.

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