Couldn't determine an appropriate version of runtime to run
问题 I just finished upgrading to beta4. My code compiles successfully with no errors/warnings but I am unable to launch my web api hosted in IIS Express (by hitting F5 ). I get the following error: Couldn't determine an appropriate version of runtime to run. See http://go.microsoft.com/fwlink/?LinkId=517742 for more information. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where