initial file issue in android studio

[carolinafootnotes]

Internal error: Invalid argument(s): Missing library: dart:async
Libraries: [dart:core]
Root children: [dart:core, dart:async]
Readers: []
Log: [load][cycle: [1][LibraryFileKind(file:///Users/nate/StudioProjects/fantastic-octo-invention/lib/models/app_settings.dart = /Users/nate/StudioProjects/fantastic-octo-invention/lib/models/app_settings.dart)]]
[load][cycle: [0][LibraryFileKind(dart:core = /Users/nate/Documents/historical markers/landmark data/flutter/flutter/bin/cache/dart-sdk/lib/core/core.dart)]]

#0 LinkedElementFactory._reportMissingLibrary (package:analyzer/src/summary2/linked_element_factory.dart:278)
#1 LinkedElementFactory.libraryOfUri2 (package:analyzer/src/summary2/linked_element_factory.dart:177)
#2 LinkedElementFactory.dartAsyncElement (package:analyzer/src/summary2/linked_element_factory.dart:50)
#3 Linker._createTypeSystem (package:analyzer/src/summary2/link.dart:322)
#4 Linker._buildOutlines (package:analyzer/src/summary2/link.dart:233)
#5 Linker.link. (package:analyzer/src/summary2/link.dart:110)
#6 OperationPerformanceImpl.run (package:analyzer/src/util/performance/operation_performance.dart:180)
#7 Linker.link (package:analyzer/src/summary2/link.dart:109)
#8 link (package:analyzer/src/summary2/link.dart:43)
#9 LibraryContext._loadBundle. (package:analyzer/src/dart/analysis/library_context.dart:237)
#10 OperationPerformanceImpl.run (package:analyzer/src/util/performance/operation_performance.dart:180)
#11 LibraryContext._loadBundle (package:analyzer/src/dart/analysis/library_context.dart:292)
#12 LibraryContext._loadBundle (package:analyzer/src/dart/analysis/library_context.dart:212)
#13 LibraryContext.load. (package:analyzer/src/dart/analysis/library_context.dart:145)
#14 OperationPerformanceImpl.run (package:analyzer/src/util/performance/operation_performance.dart:180)
#15 LibraryContext.load (package:analyzer/src/dart/analysis/library_context.dart:144)
#16 AnalysisDriver._produceErrors.. (package:analyzer/src/dart/analysis/driver.dart:2080)
#17 OperationPerformanceImpl.run (package:analyzer/src/util/performance/operation_performance.dart:180)
#18 AnalysisDriver._getErrors. (package:analyzer/src/dart/analysis/driver.dart:1753)
#19 OperationPerformanceImpl.run (package:analyzer/src/util/performance/operation_performance.dart:180)
#20 AnalysisDriver._getErrors (package:analyzer/src/dart/analysis/driver.dart:1741)
#21 AnalysisDriver.performWork (package:analyzer/src/dart/analysis/driver.dart:1203)
#22 AnalysisDriverScheduler._run (package:analyzer/src/dart/analysis/driver.dart:2659)

null
[RequestError code: SERVER_ERROR, message: Invalid argument(s): Missing library: dart:async
Libraries: [dart:core]
Root children: [dart:core, dart:async]
Readers: []
Log: [load][cycle: [1][LibraryFileKind(file:///Users/nate/StudioProjects/fantastic-octo-invention/lib/models/app_settings.dart = /Users/nate/StudioProjects/fantastic-octo-invention/lib/models/app_settings.dart)]]
[load][cycle: [0][LibraryFileKind(dart:core = /Users/nate/Documents/historical markers/landmark data/flutter/flutter/bin/cache/dart-sdk/lib/core/core.dart)]]

#0 LinkedElementFactory._reportMissingLibrary (package:analyzer/src/summary2/linked_element_factory.dart:278)
#1 LinkedElementFactory.libraryOfUri2 (package:analyzer/src/summary2/linked_element_factory.dart:177)
#2 LinkedElementFactory.dartAsyncElement (package:analyzer/src/summary2/linked_element_factory.dart:50)
#3 Linker._createTypeSystem (package:analyzer/src/summary2/link.dart:322)
#4 Linker._buildOutlines (package:analyzer/src/summary2/link.dart:233)
#5 Linker.link. (package:analyzer/src/summary2/link.dart:110)
#6 OperationPerformanceImpl.run (package:analyzer/src/util/performance/operation_performance.dart:180)
#7 Linker.link (package:analyzer/src/summary2/link.dart:109)
#8 link (package:analyzer/src/summary2/link.dart:43)
#9 LibraryContext._loadBundle. (package:analyzer/src/dart/analysis/library_context.dart:237)
#10 OperationPerformanceImpl.run (package:analyzer/src/util/performance/operation_performance.dart:180)
#11 LibraryContext._loadBundle (package:analyzer/src/dart/analysis/library_context.dart:292)
#12 LibraryContext._loadBundle (package:analyzer/src/dart/analysis/library_context.dart:212)
#13 LibraryContext.load. (package:analyzer/src/dart/analysis/library_context.dart:145)
#14 OperationPerformanceImpl.run (package:analyzer/src/util/performance/operation_performance.dart:180)
#15 LibraryContext.load (package:analyzer/src/dart/analysis/library_context.dart:144)
#16 AnalysisDriver._produceErrors.. (package:analyzer/src/dart/analysis/driver.dart:2080)
#17 OperationPerformanceImpl.run (package:analyzer/src/util/performance/operation_performance.dart:180)
#18 AnalysisDriver._getErrors. (package:analyzer/src/dart/analysis/driver.dart:1753)
#19 OperationPerformanceImpl.run (package:analyzer/src/util/performance/operation_performance.dart:180)
#20 AnalysisDriver._getErrors (package:analyzer/src/dart/analysis/driver.dart:1741)
#21 AnalysisDriver.performWork (package:analyzer/src/dart/analysis/driver.dart:1203)
#22 AnalysisDriverScheduler._run (package:analyzer/src/dart/analysis/driver.dart:2659)

]