Has anyone seen this error? I fell confident it's being caused by some Javascript issue. However, I have know idea where to even look. I have no idea what is causing this. No where...I repeat nowhere in my project am I using a parameter called "propName". On the page where this occurs I have an CollapsilePanel, an ImageButton, a GridView and a SqlDataSource which is using a stored procedure needing one parameter; an integer call "ctrl_id". I am passing this in a Session variable. The error appears in a popup window after I click th imagebutton. The image button simple makes the GridView visible. This error came out of the blue...I have run this page a hundred times and haven't changed anything for days and then all of a sudden I get this.
Any help would be greatly appreciated