[Flex3] An internal compiler error occurred

If you encounter the "An internal compiler error occurred" in Flex Builder, open the error log view (window > show view > other > PDE Runtime > Error Log) and double click the error item.

If something like the below happens, check to see whether the code pieces contain empty switches.

This bug has been fixed at SDK 3.0.1.1739.

java.lang.NullPointerException
at macromedia.asc.semantics.ConfigurationEvaluator.evaluate(Unknown Source)
at macromedia.asc.parser.SwitchStatementNode.evaluate(Unknown Source)
at macromedia.asc.semantics.ConfigurationEvaluator.evalAndFold(Unknown Source)
at macromedia.asc.semantics.ConfigurationEvaluator.evaluate(Unknown Source)
at macromedia.asc.parser.StatementListNode.evaluate(Unknown Source)
at macromedia.asc.semantics.ConfigurationEvaluator.evaluate(Unknown Source)
at macromedia.asc.parser.FunctionCommonNode.evaluate(Unknown Source)
at macromedia.asc.semantics.ConfigurationEvaluator.evaluate(Unknown Source)
at macromedia.asc.parser.FunctionDefinitionNode.evaluate(Unknown Source)
at macromedia.asc.semantics.ConfigurationEvaluator.evaluate(Unknown Source)
at macromedia.asc.parser.StatementListNode.evaluate(Unknown Source)
at macromedia.asc.semantics.ConfigurationEvaluator.evaluate(Unknown Source)
at macromedia.asc.parser.ClassDefinitionNode.evaluate(Unknown Source)
at macromedia.asc.semantics.ConfigurationEvaluator.evaluate(Unknown Source)
at macromedia.asc.parser.StatementListNode.evaluate(Unknown Source)
at macromedia.asc.semantics.ConfigurationEvaluator.evaluate(Unknown Source)
at macromedia.asc.parser.ProgramNode.evaluate(Unknown Source)
at flex2.compiler.as3.Compiler.parse1(Compiler.java:314)
at flex2.compiler.API.parse1(API.java:2306)
at flex2.compiler.API.parse1(API.java:2259)
at flex2.compiler.API.batch2(API.java:367)
at flex2.compiler.API.batch(API.java:1108)
at flex2.compiler.API.compile(API.java:1281)
at flex2.tools.oem.Application.compile(Application.java:1028)
at flex2.tools.oem.Application.recompile(Application.java:980)
at flex2.tools.oem.Application.compile(Application.java:636)
at flex2.tools.flexbuilder.BuilderApplication.compile(BuilderApplication.java:354)
at com.adobe.flexbuilder.multisdk.compiler.internal.ASApplicationBuilder$MyBuilder.mybuild(ASApplicationBuilder.java:271)
at com.adobe.flexbuilder.multisdk.compiler.internal.ASApplicationBuilder.build(ASApplicationBuilder.java:122)
at com.adobe.flexbuilder.multisdk.compiler.internal.ASBuilder.build(ASBuilder.java:139)
at com.adobe.flexbuilder.multisdk.compiler.internal.ASItemBuilder.build(ASItemBuilder.java:73)
at com.adobe.flexbuilder.project.compiler.internal.FlexProjectBuilder.buildItem(Unknown Source)
at com.adobe.flexbuilder.project.compiler.internal.FlexProjectBuilder.build(Unknown Source)
at com.adobe.flexbuilder.project.compiler.internal.FlexIncrementalBuilder.build(Unknown Source)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:624)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:166)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:197)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:246)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:249)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:302)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:334)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:137)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:235)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)