Compile with Proguard gives SimException: "local variable type mismatch"

Question

When I compile my Android Application with Proguard enabled I get the following error:

-dex:
 [echo] Converting compiled files and external libraries into /home/ka/dev/workspace/ImPress/build/classes.dex...
[apply] 
[apply] UNEXPECTED TOP-LEVEL EXCEPTION:
[apply] com.android.dx.cf.code.SimException: local variable type mismatch: attempt to set or access a value of type java.io.File using a local variable of type java.lang.Object[]. This is symptomatic of .class transformation tools that ignore local variable information.
[apply]     at com.android.dx.cf.code.BaseMachine.throwLocalMismatch(BaseMachine.java:550)
[apply]     at com.android.dx.cf.code.BaseMachine.getLocalTarget(BaseMachine.java:405)
[apply]     at com.android.dx.cf.code.BaseMachine.storeResults(BaseMachine.java:532)
[apply]     at com.android.dx.cf.code.ValueAwareMachine.run(ValueAwareMachine.java:197)
[apply]     at com.android.dx.cf.code.RopperMachine.run(RopperMachine.java:291)
[apply]     at com.android.dx.cf.code.Simulator$SimVisitor.visitLocal(Simulator.java:608)
[apply]     at com.android.dx.cf.code.BytecodeArray.parseInstruction(BytecodeArray.java:526)
[apply]     at com.android.dx.cf.code.Simulator.simulate(Simulator.java:99)
[apply]     at com.android.dx.cf.code.Ropper.processBlock(Ropper.java:684)
[apply]     at com.android.dx.cf.code.Ropper.doit(Ropper.java:639)
[apply]     at com.android.dx.cf.code.Ropper.convert(Ropper.java:252)
[apply]     at com.android.dx.dex.cf.CfTranslator.processMethods(CfTranslator.java:252)
[apply]     at com.android.dx.dex.cf.CfTranslator.translate0(CfTranslator.java:131)
[apply]     at com.android.dx.dex.cf.CfTranslator.translate(CfTranslator.java:85)
[apply]     at com.android.dx.command.dexer.Main.processClass(Main.java:369)
[apply]     at com.android.dx.command.dexer.Main.processFileBytes(Main.java:346)
[apply]     at com.android.dx.command.dexer.Main.access$400(Main.java:59)
[apply]     at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:294)
[apply]     at com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:244)
[apply]     at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:130)
[apply]     at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:108)
[apply]     at com.android.dx.command.dexer.Main.processOne(Main.java:313)
[apply]     at com.android.dx.command.dexer.Main.processAllFiles(Main.java:233)
[apply]     at com.android.dx.command.dexer.Main.run(Main.java:185)
[apply]     at com.android.dx.command.dexer.Main.main(Main.java:166)
[apply]     at com.android.dx.command.Main.main(Main.java:90)
[apply] ...at bytecode offset 00000006
[apply] locals[0000]: Lcom/officemax/impress/ui/library/task/DocumentBrowserTask;
[apply] locals[0001]: [Ljava/lang/Object;
[apply] locals[0002]: <invalid>
[apply] ...while working on block 0006
[apply] ...while working on method doTaskJob:([Ljava/lang/Object;)Lcom/kaciula/utils/ui/BasicTaskResponse;
[apply] ...while processing doTaskJob ([Ljava/lang/Object;)Lcom/kaciula/utils/ui/BasicTaskResponse;
[apply] ...while processing com/officemax/impress/ui/library/task/DocumentBrowserTask.class
[apply] 
[apply] 1 error; aborting

How can I fix this problem?

Answer 1

I ran into the same problem after adding the -dontobfuscate flag to my proguard.cfg file.

The solution ended up being that I needed to add this to my optimizations:

!code/allocation/variable

This makes my complete optimization string look like this:

-optimizations !field/removal/writeonly,!field/marking/private,!class/merging/*,!code/allocation/variable