Webconfig error in vb.net

Question

Error2It 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.E:\shopaquasportbck2014\tirage\web.config39




<authentication mode="Forms">
<forms name=".authTirage" path="/" loginUrl="admin/login.aspx" protection="All" timeout="20" defaultUrl="admin/index.aspx">
<credentials passwordFormat="Clear">
<user name="martial" password="miri01"></user>
<user name="simon" password="simon113"></user>
</credentials>
</forms>
</authentication>