Normally inside your .csproj file you would have a line like:
<MauiSplashScreen Include="Resources\Splash\splash.svg" Color="#000000" BaseSize="128,128" />
It works for all platforms except WIndows. To avoid this error add a copy of your splash.svg inside Resources\Images and add the following in the .csproj file:
<MauiImage Update="Resources\Images\yourlogo.svg" BaseSize="208,208" />