Autoplay is not working and errors are display on stack

[fykid]

E/flutter ( 7048): NoSuchMethodError: The method 'round' was called on null.
E/flutter ( 7048): Receiver: null
E/flutter ( 7048): Tried calling: round()
E/flutter ( 7048): #0 Object.noSuchMethod (dart:core/runtime/libobject_patch.dart:46:5)
E/flutter ( 7048): #1 PageController.nextPage (package:flutter/src/widgets/page_view.dart:142:31)
E/flutter ( 7048): #2 CarouselState.initState. (package:carousel_pro/src/carousel_pro.dart:117:23)
E/flutter ( 7048): #3 _Timer._runTimers (dart:isolate/runtime/libtimer_impl.dart:382:19)
E/flutter ( 7048): #4 _Timer._handleMessage (dart:isolate/runtime/libtimer_impl.dart:416:5)
E/flutter ( 7048): #5 _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:165:12)
D/ ( 7048): HostConnection::get() New Host Connection established 0xa8508440, tid 7205
D/EGL_emulation( 7048): eglMakeCurrent: 0x9ae32820: ver 2 0 (tinfo 0xa85031f0)