To fix this issue is straightforward and it requires you to configure the IIS (Internet Information Services). Please follow the below steps to do the same:

1. Open applicationhost.config file from C:\Windows\System32\inetsrv\config
2. Change this line (do this by copying the below line into Find (Ctrl + F) and press enter to go to this line):

<add name=”ExtensionlessUrl-Integrated-4.0″ path=”*.” verb=”GET,HEAD,POST,DEBUG” type=”System.Web.Handlers.TransferRequestHandler” preCondition=”integratedMode,runtimeVersionv4.0″ />

to

<add name=”ExtensionlessUrl-Integrated-4.0″ path=”*.” verb=”GET,HEAD,POST,DEBUG,PUT,DELETE” type=”System.Web.Handlers.TransferRequestHandler” preCondition=”integratedMode,runtimeVersionv4.0″ />

3. Make these lines into comment statements. Similar to earlier step where you copy and find these lines and then replace them with the one provided.

Before

————————-
<add name=”WebDAVModule” image=”%windir%\System32\inetsrv\webdav.dll” />
<add name=”WebDAVModule” />
<add name=”WebDAV” path=”*” verb=”PROPFIND,PROPPATCH,MKCOL,PUT,COPY,DELETE,MOVE,LOCK,UNLOCK” modules=”WebDAVModule” resourceType=”Unspecified” requireAccess=”None” />

After

————————-
!–<add name=”WebDAVModule” image=”%windir%\System32\inetsrv\webdav.dll” />–>
!–<add name=”WebDAVModule” /> –>
!–<add name=”WebDAV” path=”*” verb=”PROPFIND,PROPPATCH,MKCOL,PUT,COPY,DELETE,MOVE,LOCK,UNLOCK” modules=”WebDAVModule” resourceType=”Unspecified” requireAccess=”None” />–>

4. Remove webDAV from IIS Handler Mappings by:
——————————————-

Open IIS Manager>> Double click Handler Mappings >> Find WebDAV in the list and remove.

After doing these steps correctly, deleting function will work.