Bad state: No element while parsing

[vishnudasRapidor]

When parsing excel i'm getting Bad state: No element error

stack trace

Error: Bad state: No element
http://localhost:50669/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 297:3  throw_
http://localhost:50669/dart-sdk/lib/core/iterable.dart 674:25                                       get single
http://localhost:50669/packages/excel/src/parser/parse.dart 275:49                                  <fn>
http://localhost:50669/dart-sdk/lib/core/iterable.dart 347:29                                       forEach
http://localhost:50669/packages/excel/src/parser/parse.dart 245:32                                  [_parseStyles]
http://localhost:50669/packages/excel/src/parser/parse.dart 16:5                                    [_startParsing]
http://localhost:50669/packages/excel/src/excel.dart 82:5                                           __
http://localhost:50669/packages/excel/src/excel.dart 17:20                                          _newExcel
http://localhost:50669/packages/excel/src/excel.dart 97:12                                          decodeBytes
http://localhost:50669/packages/ondc_seller_web/apps/common/ui/widgets/file_drop_target.dart 89:27  pickFile
http://localhost:50669/dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 45:50           <fn>
http://localhost:50669/dart-sdk/lib/async/zone.dart 1661:54                                         runUnary
http://localhost:50669/dart-sdk/lib/async/future_impl.dart 162:18                                   handleValue
http://localhost:50669/dart-sdk/lib/async/future_impl.dart 838:44                                   handleValueCallback
http://localhost:50669/dart-sdk/lib/async/future_impl.dart 867:13                                   _propagateToListeners
http://localhost:50669/dart-sdk/lib/async/future_impl.dart 464:9                                    callback
http://localhost:50669/dart-sdk/lib/async/schedule_microtask.dart 40:11                             _microtaskLoop
http://localhost:50669/dart-sdk/lib/async/schedule_microtask.dart 49:5                              _startMicrotaskLoop
http://localhost:50669/dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 181:7           <fn>