A VideoPlayerController was used after being disposed. Once you have called dispose() on a VideoPlayerController, it can no longer be used.

[sabahsayedk2000]

void initState() {
super.initState();
_razorpay = Razorpay();
_razorpay.on(Razorpay.EVENT_PAYMENT_SUCCESS, handlePaymentSucces);
_razorpay.on(Razorpay.EVENT_PAYMENT_ERROR, handlePaymentError);
_razorpay.on(Razorpay.EVENT_EXTERNAL_WALLET, handleExternalWallet);

coursePrice = widget.courseModel.ogprice + '00';
coursename = widget.courseModel.coursename;
username = userModel!.name;
docidcourse = widget.courseModel.docid;

flickManager = FlickManager(
  videoPlayerController:
  VideoPlayerController.networkUrl(Uri.parse("${widget.courseModel.demovideolink.toString()}")),
  autoPlay: false, // Start playing as soon as the video loads
);

} @OverRide
void dispose() {
// Ensure proper disposal of resources
flickManager.dispose();
_razorpay.clear();
// flickManager.flickVideoManager?.videoPlayerController?.dispose();

super.dispose();

}