control in tabview error

[aadog]

Performing hot restart... E/flutter (18054): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception: E/flutter (18054): 'package:flutter/src/widgets/page_view.dart': Failed assertion: line 96 pos 7: 'positions.isNotEmpty': PageController.page cannot be accessed before a PageView is built with it. E/flutter (18054): #0 _AssertionError._doThrowNew (dart:core/runtime/liberrors_patch.dart:37:39) E/flutter (18054): #1 _AssertionError._throwNew (dart:core/runtime/liberrors_patch.dart:33:5) E/flutter (18054): #2 PageController.page (package:flutter/src/widgets/page_view.dart) E/flutter (18054): #3 CarouselState.initState. (package:carousel_pro/src/carousel_pro.dart:110:24) E/flutter (18054): #4 _Timer._runTimers (dart:isolate/runtime/libtimer_impl.dart:382:19) E/flutter (18054): #5 _Timer._handleMessage (dart:isolate/runtime/libtimer_impl.dart:416:5) E/flutter (18054): #6 _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:165:12) Restarted app in 1,805ms. I/flutter (18054): start