Sometimes, keeping the resource or image in your case in Drawable folder doesn’t get added to ItemGroup/resource group.
You can simply open the .csproj file of your project and validate that if the image name is present in the < ItemGroup > section.. it must be like below if your image name and extension is panicbtn2.png:
<AndroidResource Include="Resources\drawable\panicbtn2.png" />
If it’s not present there, then you can add the same there or you can right click the drawable folder and choose add files and simply add the file again through IDE/Visual Studio. That might help.
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solved Android ImageButton display error