panel!=null || panel builder!=null is not true

[JaySoni26]

======== Exception caught by widgets library =======================================================
The following assertion was thrown building HomeScreen(dirty, state: _HomeScreenState#94ce4(tickers: tracking 1 ticker)):
'package:sliding_up_panel/src/panel.dart': Failed assertion: line 199 pos 16: 'panel != null || panelBuilder != null': is not true.

[yunus-floo]

panel must be set to widget, not allowed to null

SlidingUpPanel(
        body: Container(),
        panel: Container(
          width: 100.w,
          decoration: BoxDecoration(color: Theme.of(context).colorScheme.surface),
        ),
      ),