Error: It is an error to use a section registered as allowDe

Sep 17 2019 4:07 AM

When Rebuild web.net asp.net error "It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level. This error can be caused by a virtual directory not being configured as an application in IIS." press F5 to run normally, but Rebuild the error above, this error how to fix it?
error