Virtual path maps to another application

Question

First, I'm not sure if I am in the correct Forum please direct to proper forum if it is wrong.

I'm am getting the following error when I run my VS2019 WCF app. (Note it was originally written in VS2019)

[ArgumentException: The virtual path '/MyApp/MyService.svc' maps to another application, which is not allowed.]
   System.Web.CachedPathData.GetVirtualPathData(VirtualPath virtualPath, Boolean permitPathsOutsideApp) +247
   System.Web.HttpContext.GetFilePathData() +31
   System.Web.HttpContext.GetConfigurationPathData() +27
   System.Web.Configuration.RuntimeConfig.GetConfig(HttpContext context) +48
   System.Web.Configuration.CustomErrorsSection.GetSettings(HttpContext context, Boolean canThrow) +42
   System.Web.HttpResponse.ReportRuntimeError(Exception e, Boolean canThrow, Boolean localExecute) +103
   System.Web.HttpContext.ReportRuntimeErrorIfExists(RequestNotificationStatus& status) +485

My Project file has the following in it;

<VisualStudio>
  <FlavorProperties GUID="...">
   <WebProjectProperties>
     <UseIIS>True</UseIIS>
     <AutoAssignPort>True</AutoAssignPort>
     <DevelopmentServerPort>7821</DevelopmentServerPort>
     <DevelopmentServerVPath>/</DevelopmentServerVPath>
     <IISUrl>http://localhost:9630/WCF/MyService.svc/rest</IISUrl>
     <OverrideIISAppRootUrl>True</OverrideIISAppRootUrl>
     <IISAppRootUrl>http://localhost:9630/WCF/MyService.svc/rest</IISAppRootUrl>
     <NTLMAuthentication>False</NTLMAuthentication>
     <UseCustomServer>False</UseCustomServer>
     <CustomServerUrl>
     </CustomServerUrl>
     <SaveServerSettingsInUserFile>False</SaveServerSettingsInUserFile>
     <servers defaultServer="">
       <server name="SelfHostServer" exePath="" cmdArgs="" url="http://localhost:9620/" workingDir="" />
     </servers>
   </WebProjectProperties>
  </FlavorProperties>
</VisualStudio>

Now, the app was working before I upgraded to VS2019 16.11.35. Also, IIS 10 Express is installed. I am lost why this is happening now. Can anyone offer insights or solution to this issue?

Thank you!