Someone please help me what is the cause for this issue

Your response is highly appreicated.

Hi Madhan,

What error are you getting and what is the code you are using?

Regards,

Gert

Hi Cert,

There is a webservice has been hosted in webserver, i just consuming then in K2 server code and passing required parameter from K2. i had created wrapper class and add the webreference to point to this webservice and builded, then used the dll in K2 to call that the method. webmthod does creating the sharepoint site when it created it returns true or any error it returns false,

.net web application when use this it returning true, but in K2 it always returning false, no logs also at event viewer.

The first step would be to find out why it is returning false so then you can understand what the problem is.  Without that, you're just guessing.

Here's my guess.  You say the web service creates a SharePoint site.  Is the K2 service account a site collection administrator so it has rights to create a site? 

Have you tried using the K2 event wizard for creating your site?