当试图在 IntelliJ IDEA 中编译/运行我的 Flutter 项目时，我收到了这个错误（没有提示它与我的代码的哪一部分相关）。请问有什么想法吗？谢谢！！
Unhandled exception:
NoSuchMethodError: The getter 'file' was called on null.
Receiver: null
Tried calling: file
#0 Object.noSuchMethod (dart:core-patch/object_patch.dart:53:5)
#1 ProgramCompiler.visitAssertStatement (package:dev_compiler/src/kernel/compiler.dart:3468:59)
#2 ProgramCompiler._initializeFields (package:dev_compiler/src/kernel/compiler.dart:1521:20)
#3 ProgramCompiler._emitConstructorBody (package:dev_compiler/src/kernel/compiler.dart:1392:14)
#4 ProgramCompiler._emitConstructor.<anonymous closure>.<anonymous closure> (package:dev_compiler/src/kernel/compiler.dart:1355:19)
#5 ProgramCompiler._superDisallowed (package:dev_compiler/src/kernel/compiler.dart:3122:24)
#6 ProgramCompiler._emitConstructor.<anonymous closure> (package:dev_compiler/src/kernel/compiler.dart:1354:15)
#7 ProgramCompiler._withLetScope (package:dev_compiler/src/kernel/compiler.dart:2096:25)
#8 ProgramCompiler._withCurrentFunction (package:dev_compiler/src/kernel/compiler.dart:3112:18)
#9 ProgramCompiler._emitConstructor (package:dev_compiler/src/kernel/compiler.dart:1352:16)
#10 ProgramCompiler._defineConstructors (package:dev_compiler/src/kernel/compiler.dart:972:38)
#11 ProgramCompiler._emitClassDeclaration (package:dev_compiler/src/kernel/compiler.dart:567:19)
#12 ProgramCompiler._emitClass (package:dev_compiler/src/kernel/compiler.dart:510:21)
#13 List.forEach (dart:core-patch/growable_array.dart:282:8)
#14 ProgramCompiler._emitLibrary (package:dev_compiler/src/kernel/compiler.dart:459:23)
#15 List.forEach (dart:core-patch/growable_array.dart:282:8)
#16 ProgramCompiler.emitModule (package:dev_compiler/src/kernel/compiler.dart:345:15)
#17 JavaScriptBundler.compile (package:frontend_server/src/javascript_bundle.dart:133:33)
<asynchronous suspension>
....
Finished with error: the Dart compiler exited unexpectedly.
Failed to compile application.