help me what is this error

Question

Error    1    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.    H:\20.8.13\WEb\hospital\hospital-management-system-developed-in-aspdotnet-csharp-and-sqlserver\Hospital Management System Source Code\web.config    4