Hello Rui Martinho,

From the error you are getting, I have seen this in the past.  Please check the following:

 - If your page is a page that starts a process it needs to be a Plan Page.
- If it is a page with a Plan Button, it needs to be a Plan Page.
- If it is a Client Page it needs a Finish / Update Button.

 After verifying this please let me know if this helped with your issue.

Cheers,

Jon

Hi, thanks for your reply,

This is not a smartform (I'm not working with plan pages/client pages), it's a normal aspx (K2 Blackpearl) and I'm using K2 objects to connect. I'm using the method OpenWorklistItem(SerialNumber, "ASP"), which I know it works, I've done it both in K2.net 2003 and blackpearl(K2 vpc). But in this environment I'm getting this error.

Yes, I have integrated authentication and impersonation, I was able to start the process instance.

My mistake... I was using an url address in the client event that has the connections for K2.Net 2003. Just realized it when looked in detail to the error and saw K2ROM referenced.