error Creating New Database on power bi report server

I recently installed a power bi on-premisses report server on my windows server 2016 and in PowerBI Report Server Configuration Manager I defined the web service URL and web portal URL . then when I tried to create new database on database tab , I got this error message and don't know what to do for fixing this. 

I really appreciate you for helping me.

the error message: 

Microsoft.ReportingServices.WmiProvider.WMIProviderException: An error occurred when attempting to connect to the report server remote procedure call (RPC) end point. Verify that the Report Server Windows service is running, and then retry the operation.

---> System.Runtime.InteropServices.COMException: The RPC server is not listening. (Exception from HRESULT: 0x800706B3)
--- End of inner exception stack trace ---
at Microsoft.ReportingServices.WmiProvider.RSWmiAdmin.ThrowOnError(ManagementBaseObject mo)
at Microsoft.ReportingServices.WmiProvider.RSWmiAdmin.GenerateDatabaseScript(String databaseName, Int32 lcid, Boolean isSharePointIntegrated, String& script)
at ReportServicesConfigUI.WMIProvider.RSReportServerAdmin.GenerateDatabaseScript(String databaseName, Int32 lcid, Boolean isSharePointIntegrated, String& script)