Invalid control type for list tile error

Hi,

I have tried to replace the default add confirmation button screen and map to the confirmations items list screen. The requirement is to list the confirmations items list in the confirmation screen in SAPCRMSM. But when ever I make a change in the add confirmation button, the button is disabled. So I revert the changes and tried to populate the items list in the confirmation screen using a list tile view. But I am getting Invalid control type for list tile error. I don't know where I made a mistake. Please help me to resolve the issue.

Thanks,

Basil Jose