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flutter_windows_1.17.2-stable では発生しません。 flutter_windows_v1.15.3-dev でビルドをで次のエラーが発生します。 Launching lib\main.dart on Android SDK built for x86 in debug mode... Running Gradle task 'assembleDebug'... U nhandled exception: Crash when compiling package:firebase_admob/firebase_admob.dart, at character offset null: NoSuchM ethodError: The method 'accept' was called on null. Receiver: null Tried calling: accept (Instance of '_DemotionNonNullification') #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:53:5) #1 demoteTypeInLibrary (package:front_end/src/fasta/type_inference/type_demotion.dart:65:14) #2 TypeInferrerImpl.inferDeclarationType (package:front_end/src/fasta/type_inference/type_inferrer.dart:1889:14) #3 InferenceVisitor.visitVariableDeclaration (package:front_end/src/fasta/kernel/inference_visitor.dart:5337:31) #4 VariableDeclaration.accept (package:kernel/ast.dart:5495:43) #5 TypeInferrerImpl.inferStatement (package:front_end/src/fasta/type_inference/type_inferrer.dart:3245:24) #6 InferenceVisitor._visitStatements (package:front_end/src/fasta/kernel/inference_visitor.dart:299:20) #7 InferenceVisitor.visitBlock (package:front_end/src/fasta/kernel/inference_visitor.dart:320:30) #8 Block.accept (package:kernel/ast.dart:4722:43) #9 TypeInferrerIm pl.inferStatement (package:front_end/src/fasta/type_inference/type_inferrer.dart:3245:24) # 10 TypeInferrerImpl.inferLocalFunction (package:front_end/src/fa sta/type_inference/type_inferrer.dart:2595:43) #11 Inf erenceVisitor.visitFunctionNode (package:front_end/ src/fasta/kernel/inference_visitor.dart:1041:21) # 12 InferenceVisitor.visitFunctionExpression (package:front_end/s rc/fasta/ kernel/inference_visitor.dart:1065:9) #13 FunctionExpr ession.accept1 (package:kernel/ast.dart:4523:9 ) #14 TypeInferrerImpl.inferExpression (package:fr ont_end/src/fasta/type_inference/type_inferrer.d art:1988:27) #15 InferenceVisitor.inferMapEntry (packa ge:front_end/src/fasta/kernel/inference_visitor .dart:1998:56) #16 InferenceVisitor.visitMapLiteral ( package:front_end/src/fasta/kernel/inference_vis itor.dart:2161:17) #17 MapLiteral.accept1 (package: kernel/ast.dart:4431:9) #18 TypeI nferrerImpl.inferExpression (package:front_end/src/fasta /type_inference/type _inferrer.dart:1988:27) #19 _ImplicitFieldTypeRoot. computeType (package:fr ont_end/src/fasta/kernel/implicit_field_type.dart:138:55) #20 SourceFieldBuilder.inferType (package:front_e nd/src/fasta/builder/field_builder.dart:334:47) #21 SourceLoader.performTopLevelInference (package:fro nt_end/src/fasta/source/source_loader.dart:1109:35) #2 2 KernelTarget.buildOutlines. (package:front_end/src/fasta/kernel/kernel_target .dart:312:14) #23 withCrashReporting (package:front_end/sr c/fasta/crash.dart:122:24) #24 KernelTarget.buildOut lines (package:front_end/src/fasta/kernel/kernel_tar get.dart:288:12) #25 generateKernelInternal. (package:front_end/src/kernel_generat or_impl.dart:108:28) #26 withCrashReporting (package:fro nt_end/src/fasta/crash.dart:122:24) #27 generateKernelInte rnal (package:front_end/src/kernel_generator_impl.dart:70:10) #28 ke rnelForProgramInternal. (package:front_end/src/ api_prototype/kernel_generator.dart:61:35) #29 Compiler Context.runWithOptions. (package:front_end/sr c/fasta/compiler_context.dart:135:20) #30 CompilerC ontext.runInContext. . (pack age:front_end/src/fasta/compiler_context.dart:123: 46) #31 new Future.sync (dart:async/future.dar t:224:31) #32 CompilerContext.runInContext. (package:front_end/src/fasta/compiler_context.dart:123:1 9) #33 _rootRun (dart:async/zone.dart:1126:13) #34 _Cus tomZone.run (dart:async/zone.dart:1023:19) #35 _ runZoned (dart:async/zone.dart:1518:10) #36 runZoned (dart:async/zone.dart:1465:12) #37 CompilerContext. runInContext (package:front_end/src/fasta/compiler_con text.dart:122:12) #38 CompilerContext.runWithOpt ions (package:front_end/src/fasta/compiler_context.da rt:133:10) #39 kernelForProgramInternal (package:f ront_end/src/api_prototype/kernel_generator.dart :60:32) #40 kernelForProgram (package:front_end/ src/api_prototype/kernel_generator.dart:52:17) # 41 compileToKernel (package:vm/kernel_front_end.da rt:319:41) #42 FrontendCompiler.compile. (package:frontend_server/frontend_ser ver.dart:452:54) #43 new Future. (dart:async/future.dart:176:37) #44 _rootRun (dart:async/zone.dart:1122:38) #45 _CustomZon e.run (dart:async/zone.dart:1023:19) #46 _CustomZone.ru nGuarded (dart:asyn c/zone.dart:925:7) #47 _CustomZone.bindCallbackGuarded. (dart:async/zone.dart:965:23) #4 8 _rootRun (dart:async/zone.dart:1126:13) #49 _CustomZone.run (dart:async/zone.dart:1023:19) # 50 _CustomZone.bindCallback. (da rt:async/zone.dart:949:23) #51 Timer._createTimer. (dart:async-patch/timer_patch.dart:23:15) #52 _Timer._runTimers (dart:isolate-patch/timer_impl.dart:398:19) #53 _Ti mer._handleMessage (dart:isolate-patch/t imer_impl.dart:429:5) #54 _RawReceivePortImpl._handleMess age (dart:isola te-patch/isolate_patch.dart:168:12) #0 Object.noSuchMet hod (dart:core-patch/object_patch.dart:53:5) #1 d emoteTypeInLibrary (package:front_end/src/fasta/type_infe rence/type_demotion.dart:65:14) #2 TypeInferrerImpl.inferDec larationType (package:fr ont_end/src/fasta/type_inference/type_inferrer.dart:1889: 14) #3 InferenceVis itor.visitVariableDeclaration (package:front_end/src/fast a/kernel/inference_visitor.dart:5337:31) #4 Var iableDeclaration.accept (package:kernel/ast.dart:549 5:43) #5 TypeInferrerImpl.inferStatement (pack age:front_end/src/fasta/type_inference/type_infe rrer.dart:3245:24) #6 InferenceVisitor._visitStatem ents (package:front_end/src/fasta/kernel/inferen ce_visitor.dart:299:20) #7 InferenceVisitor.vi sitBlock (package:front_end/src/fasta/kernel/inf erence_visitor.dart:320:30) #8 Block.accept (package:kernel/ast.dart: 4722:43) #9 TypeInferrerIm pl.inferStatement (package:front_end/src/fasta/type_inference/ type_inferrer.dart:3245:24) # 10 TypeInferrerImpl.inferLocalFunction (package:f ront_end/src/fasta/type_inference/type_inferrer.dart: 2595:43) #11 InferenceVisitor.visi tFunctionNode (package:fro nt_end/src/fasta/kernel/inference_visitor.dart:1041:2 1) #12 InferenceVisitor.visitFunctionExpr ession (package:front_end/src/fas ta/kernel/inference_visitor.dart:1065:9) #13 FunctionExpression.accept1 (package:kernel/ast.dart:4523:9) # 14 TypeInferrerImpl.inferExpression (package:front_end/src/fasta/type_inference/t ype_inferrer.dart:1988:27) #15 InferenceVisitor.inferMapEntry (package:front_en d/src/fasta/kernel/inference_visitor.dart:1998:56) #16 In ferenceVisitor.visitMapLiteral (package:front_end/src/fas ta/kernel/infe rence_visitor.dart:2161:17) #17 MapLiteral.accept1 (p ackage:kernel/ast.dart:4431:9) #18 TypeInferrerImp l.inferExpression (package:front_end/src/fasta/type_infer ence/type_inferrer.dart:1988:27) #19 _ImplicitFieldT ypeRoot.computeType (package:front_end/src/fasta/kern el/implicit_field_type.dart:138:55) #20 SourceFiel dBuilder.inferType (package:front_end/src/fasta/buil der/field_builder.dart:334:47) #21 SourceLoader.per formTopLevelInference (package:front_end/src/fasta/sou rce/source_loader.dart:1109:35) #22 KernelTarget.buildOu tlines. (package:front_end/src/fa sta/kernel/kernel_target.dart:312:14) #23 withCrashReporting (package:front_end /src/fasta/crash.dart:122:24) #24 KernelTarget.build Outlines (package:front_end/src/fasta/kernel/kernel_tar get.dart:288:12) #25 generateKernelInternal. (package:front_end/src/kernel_generator_imp l.dart:108:28) #26 withCr ashReporting (package:front_end/src/fasta/crash.dart :122:24) #27 generateKernelInternal (package:front_en d/src/kernel_generator_impl.dart:70:10) #28 ker nelForProgramInternal. (package:fron t_end/src/api_prototype/kernel_generator.dart:61:35) #29 CompilerContext.runWithOptions. (packa ge:front_end/src/fasta/compiler_context.dart:135:20) #30 CompilerC ontext.runInContext. . (packa ge:front_end/src/fasta/compiler_context.dart:123:46) #31 new Futur e.sync (dart:async /future.dart:224:31) #32 CompilerContext.runInContext. (package:fr ont_end/src/fasta/compiler_context.dart:123:19) #33 _rootRun (dart:async /zone.dart:1126:13) #34 _ CustomZone.run (dart:async/zone.dart:1023:19) #35 _runZoned (dart :async/zone.dart:1518:10) #36 runZoned (dart:async/zone.dart :1465:12) #37 CompilerContext.runInContext (package:front_end/ src/fasta/compiler_context.dart:122:12) #38 CompilerContext.runWit hOptions (package:front_end/src/fasta/compiler_context.dart:133: 10) #39 kernelForProgramInternal (package:fr ont_end/src/api_prototype/kernel_generator.dart:60:32) #40 kernelForPr ogram (package:front_end/src/api_prototype/kernel_generator.dart:52:17) #41 compileToK ernel (package:vm/kernel_front_end.dart:319:41) #42 FrontendCompiler.compile. (package:frontend_server/frontend_server.dart:452:54) #43 new Futur e. (dart:async/future.dart:176:37) #44 _rootRun (dart:async/zo ne.dart:1122:38) #45 _CustomZone.run (dart:async/zone.dart:1023:19) #46 _CustomZo ne.runGuarded (dart:async/zone.dart:925:7) #47 _CustomZone.bindCallbackGuarded. (dart:async/zone.dart:965:23) #48 _root Run (dart:async/zone.dart:1126:13) #49 _CustomZone.run (dart:async/zone.dart:1023:19) #50 _CustomZone.bindCallback. (dart:async/zone.dart:949:23) #51 Timer._createTimer. (dart:async-patch/timer_patch.dart:23:15) #52 _Timer._runTimers (dart:isolate-pa tch/timer_impl.dart:398:19) #53 _Timer._handleMessage (dart:isolate-patch/timer_impl.dart: 429:5) #54 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12) Target kernel_snapshot failed: Exception: Errors during snapshot creation: null build failed. FAILURE: Build failed with an exception. * Where: Script 'D:\src\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 817 * What went wrong: Execution failed for task ':app:compileFlutterBuildDebug'. > Process 'command 'D:\src\flutter\bin\flutter.bat'' finished with non-zero exit value 1 * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights. * Get more help at https://help.gradle.org BUILD FAILED in 9s Finished with error: Gradle task assembleDebug failed with exit code 1 flutter_windows_v1.12.13+hotfix.8-stable では発生しません。

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