```e java lang IllegalStateException Backend Internal error

Question

```e java lang IllegalStateException Backend Internal error Exception during code generation Element is unknownThe root cause java util NoSuchElementException was thrown at androidx compose plugins kotlin compiler lower ComposableCallTransformer irComposableExpr ComposableCallTransformer kt 1362 at org jetbrains kotlin codegen CompilationErrorHandler lambda$static$0 CompilationErrorHandler java 35 at org jetbrains kotlin backend jvm JvmBackendFacade doGenerateFilesInternal$backend jvm JvmBackendFacade kt 93 at org jetbrains kotlin backend jvm JvmBackendFacade doGenerateFilesInternal$backend jvm$default JvmBackendFacade kt 64 at org jetbrains kotlin backend jvm JvmBackendFacade doGenerateFilesInternal$backend jvm JvmBackendFacade kt 52 at org jetbrains kotlin backend jvm JvmIrCodegenFactory generateModule JvmIrCodegenFactory kt 36 at org jetbrains kotlin codegen KotlinCodegenFacade doGenerateFiles KotlinCodegenFacade java 47 at org jetbrains kotlin codegen KotlinCodegenFacade compileCorrectFiles KotlinCodegenFacade java 39 at org jetbrains kotlin cli jvm compiler KotlinToJVMBytecodeCompiler generate KotlinToJVMBytecodeCompiler kt 638 at org jetbrains kotlin cli jvm compiler KotlinToJVMBytecodeCompiler compileModules$cli KotlinToJVMBytecodeCompiler kt 198 at org jetbrains kotlin cli jvm K2JVMCompiler doExecute K2JVMCompiler kt 172 at org jetbrains kotlin cli jvm K2JVMCompiler doExecute K2JVMCompiler kt 56 at org jetbrains kotlin cli common CLICompiler execImpl CLICompiler kt 85 at org jetbrains kotlin cli common CLICompiler execImpl CLICompiler kt 43 at org jetbrains kotlin cli common CLITool exec CLITool kt 104 Caused by java util NoSuchElementException Collection contains no element matching the predicate at androidx compose plugins kotlin compiler lower ComposableCallTransformer irComposableExpr ComposableCallTransformer kt 1362 at androidx compose plugins kotlin compiler lower ComposableCallTransformer visitBlock ComposableCallTransformer kt 252 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitBlock IrElementTransformerVoid kt 128 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitBlock IrElementTransformerVoid kt 24 at org jetbrains kotlin ir expressions impl IrBlockImpl accept IrBlockImpl kt 52 at org jetbrains kotlin ir expressions IrExpression$DefaultImpls transform IrExpression kt 28 at org jetbrains kotlin ir expressions impl IrExpressionBase transform IrExpressionBase kt 24 at org jetbrains kotlin ir expressions impl IrTypeOperatorCallImpl transformChildren IrTypeOperatorCallImpl kt 75 at org jetbrains kotlin ir visitors IrElementTransformerVoidKt transformChildrenVoid IrElementTransformerVoid kt 288 at org jetbrains kotlin ir visitors IrElementTransformerVoid transformChildrenVoid IrElementTransformerVoid kt 283 at org jetbrains kotlin ir visitors IrElementTransformerVoid transformChildren IrElementTransformerVoid kt 25 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitExpression IrElementTransformerVoid kt 112 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitTypeOperator IrElementTransformerVoid kt 214 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitTypeOperator IrElementTransformerVoid kt 215 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitTypeOperator IrElementTransformerVoid kt 24 at org jetbrains kotlin ir expressions impl IrTypeOperatorCallImpl accept IrTypeOperatorCallImpl kt 68 at org jetbrains kotlin ir expressions IrExpression$DefaultImpls transform IrExpression kt 28 at org jetbrains kotlin ir expressions impl IrExpressionBase transform IrExpressionBase kt 24 at org jetbrains kotlin ir declarations impl IrVariableImpl transformChildren IrVariableImpl kt 93 at org jetbrains kotlin ir visitors IrElementTransformerVoidKt transformChildrenVoid IrElementTransformerVoid kt 288 at org jetbrains kotlin ir visitors IrElementTransformerVoid transformChildrenVoid IrElementTransformerVoid kt 283 at org jetbrains kotlin ir visitors IrElementTransformerVoid transformChildren IrElementTransformerVoid kt 25 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitDeclaration IrElementTransformerVoid kt 46 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitVariable IrElementTransformerVoid kt 87 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitVariable IrElementTransformerVoid kt 88 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitVariable IrElementTransformerVoid kt 24 at org jetbrains kotlin ir declarations impl IrVariableImpl accept IrVariableImpl kt 86 at org jetbrains kotlin ir declarations IrDeclaration$DefaultImpls transform IrDeclaration kt 42 at org jetbrains kotlin ir declarations impl IrDeclarationBase transform IrDeclarationBase kt 27 at org jetbrains kotlin ir expressions impl IrBlockBodyImpl transformChildren IrBlockBodyImpl kt 49 at org jetbrains kotlin ir visitors IrElementTransformerVoidKt transformChildrenVoid IrElementTransformerVoid kt 288 at org jetbrains kotlin ir visitors IrElementTransformerVoid transformChildrenVoid IrElementTransformerVoid kt 283 at org jetbrains kotlin ir visitors IrElementTransformerVoid transformChildren IrElementTransformerVoid kt 25 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitBody IrElementTransformerVoid kt 93 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitBlockBody IrElementTransformerVoid kt 99 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitBlockBody IrElementTransformerVoid kt 100 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitBlockBody IrElementTransformerVoid kt 24 at org jetbrains kotlin ir expressions impl IrBlockBodyImpl accept IrBlockBodyImpl kt 40 at org jetbrains kotlin ir expressions IrBody$DefaultImpls transform IrBody kt 24 at org jetbrains kotlin ir expressions IrBlockBody$DefaultImpls transform IrBody kt at org jetbrains kotlin ir expressions impl IrBlockBodyImpl transform IrBlockBodyImpl kt 26 at org jetbrains kotlin ir declarations impl IrFunctionBase transformChildren IrFunctionBase kt 77 at org jetbrains kotlin ir visitors IrElementTransformerVoidKt transformChildrenVoid IrElementTransformerVoid kt 288 at org jetbrains kotlin ir visitors IrElementTransformerVoid transformChildrenVoid IrElementTransformerVoid kt 283 at org jetbrains kotlin ir visitors IrElementTransformerVoid transformChildren IrElementTransformerVoid kt 25 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitDeclaration IrElementTransformerVoid kt 46 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitFunction IrElementTransformerVoid kt 55 at androidx compose plugins kotlin compiler lower ComposableCallTransformer visitFunction ComposableCallTransformer kt 205 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitSimpleFunction IrElementTransformerVoid kt 58 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitSimpleFunction IrElementTransformerVoid kt 59 at org jetbrains kotlin ir visitors IrElementTransformerVoid visitSimpleFunction IrElementTransformerVoid kt 24 at org jetbrains kotlin ir declarations impl IrFunctionImpl accept IrFunctionImpl kt 89 at org jetbrains kotlin ir declarations IrDeclaration$DefaultImpls transform IrDeclaration kt 42 at org jetbrains kotlin ir declarations impl IrDeclarationBase transform IrDeclarationBase kt 27 at org jetbrains kotlin ir declarations impl IrFileImpl transformChildren IrFileImpl kt 71 at org jetbrains kotlin ir visitors IrElementTransformerVoidKt transformChildrenVoid IrElementTransformerVoid kt 288 at androidx compose plugins kotlin compiler lower ComposableCallTransformer lower ComposableCallTransformer kt 197 at org jetbrains kotlin backend common LowerKt lower Lower kt 66 at org jetbrains kotlin backend common phaser PhaseBuildersKt$makeIrModulePhase$1 invoke PhaseBuilders kt 235 at org jetbrains kotlin backend common phaser PhaseBuildersKt$makeIrModulePhase$1 invoke PhaseBuilders kt 228 at org jetbrains kotlin backend common phaser AbstractNamedPhaseWrapper$runBody$1 invoke CompilerPhase kt 128 at org jetbrains kotlin backend common phaser CompilerPhaseKt downlevel CompilerPhase kt 24 at org jetbrains kotlin backend common phaser AbstractNamedPhaseWrapper runBody CompilerPhase kt 127 at org jetbrains kotlin backend common phaser AbstractNamedPhaseWrapper invoke CompilerPhase kt 105 at org jetbrains kotlin backend common phaser CompositePhase invoke PhaseBuilders kt 29 at org jetbrains kotlin backend common phaser CompilerPhaseKt invokeToplevel CompilerPhase kt 42 at org jetbrains kotlin backend jvm JvmLower lower JvmLower kt 288 at org jetbrains kotlin backend jvm JvmBackendFacade doGenerateFilesInternal$backend jvm JvmBackendFacade kt 91 37 more e java lang IllegalStateException Backend Internal error Exception during code generation``` All I did was update this repo <https github com Zhuinden compose simple stack experiment> to dev04 and then remove `unaryPlus` from before where it was still there and boom compilation exception in compiler thinking face

zhuinden · Answer

oh it s probably this ``` composeOptions kotlinCompilerExtensionVersion 0 1 0 dev04 ```

zhuinden · Answer

solved