Image loading failed

[XiaoxiRao]

{
"context" : "resolving an image codec",
"exception" : "NoSuchMethodError: The getter 'length' was called on null.\nReceiver: null\nTried calling: length",
"stackTrace" : "#0 Utf8Encoder.convert (dart:convert/utf.dart:89)\n#1 Codec.encode (dart:convert/codec.dart:21)\n#2 keyToMd5 (package:extended_image_library/src/platform.dart:56)\n#3 ExtendedNetworkImageProvider._loadAsync (package:extended_image_library/src/_network_image_io.dart:132)\n#4 ExtendedNetworkImageProvider.load (package:extended_image_library/src/_network_image_io.dart:103)\n#5 ExtendedImageProvider.resolveStreamForKey. (package:extended_image_library/src/extended_image_provider.dart:97)\n#6 ImageCache.putIfAbsent (package:flutter/src/painting/image_cache.dart:380)\n#7 ExtendedImageProvider.resolveStreamForKey (package:extended_image_library/src/extended_image_provider.dart:95)\n#8 ScrollAwareImageProvider.resolveStreamForKey (package:flutter/src/widgets/scroll_aware_image_provider.dart:106)\n#9 ImageProvider.resolve. (package:flutter/src/painting/image_provider.dart:333)\n#10 ImageProvider._createErrorHandlerAndKey.. (package:flutter/src/painting/image_provider.dart:464)\n#11 SynchronousFuture.then (package:flutter/src/foundation/synchronous_future.dart:41)\n#12 ImageProvider._createErrorHandlerAndKey. (package:flutter/src/painting/image_provider.dart:461)\n#13 _rootRun (dart:async/zone.dart:1428)\n#14 _CustomZone.run (dart:async/zone.dart:1328)\n#15 _CustomZone.runGuarded (dart:async/zone.dart:1236)\n#16 ImageProvider._createErrorHandlerAndKey (package:flutter/src/painting/image_provider.dart:453)\n#17 ImageProvider.resolve (package:flutter/src/painting/image_provider.dart:330)\n#18 _ExtendedImageState._resolveImage (package:extended_image/src/extended_image.dart:876)\n#19 _ExtendedImageState.didChangeDependencies (package:extended_image/src/extended_image.dart:809)\n#20 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4749)\n#21 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4561)\n#22 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3631)\n#23 Element.updateChild (package:flutter/src/widgets/framework.dart:3383)\n#24 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6123)\n#25 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3631)\n#26 Element.updateChild (package:flutter/src/widgets/framework.dart:3383)\n#27 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613)\n#28 Element.rebuild (package:flutter/src/widgets/framework.dart:4311)\n#29 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4566)\n#30 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4561)\n#31 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3631)\n#32 Element.updateChild (package:flutter/src/widgets/framework.dart:3383)\n#33 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613)\n#34 Element.rebuild (package:flutter/src/widgets/framework.dart:4311)\n#35 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4566)\n#36 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4561)\n#37 Element.inflateWidget 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}