Error on running application....

Question

I have download one project from net...but getting error when i want to run this project..

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. C:\Documents and Settings\it\Desktop\latest rich text box\SampleWebSite\Web.config

Can any one help me?????