ASP.NET Core API-500 Internal Server Error, in production only

I have developed an ASP.NET WebApi application. When I publish and test it to localhost IIS I get this error on one request:

   Response with status: 500 Internal Server Error for URL: 
http://localhost/api/COMI/NEW/158/3

web.config：

      <?xml version="1.0" encoding="utf-8"?>
        <configuration>
          <system.webServer>
            <handlers>
              <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModule" 
    resourceType="Unspecified" />
            </handlers>
            <aspNetCore processPath="dotnet" arguments=".\POSweb.dll" 
stdoutLogEnabled="true" stdoutLogFile=".\logs\stdout" />
          </system.webServer>
        </configuration>
        <!--ProjectGuid: 5f28b9b3-0e00-439a-8fa1-e64186505b5e-->

Running it on IDE doesn't give any errors, how can I fix/debug.

Routing configuration:

 app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");

                routes.MapSpaFallbackRoute(
                    name: "spa-fallback",
                    defaults: new { controller = "Home", action = "Index" });
            });

thanks