Can not get the screen rectangle of this UI node. A possible reason might be that the element is not visible

I am working on a project were i’m supposed to extract some client details from a form in my case which is Membership Application Form to a desktop application (HIPQA).On my flow the activities are being executed correctly all of them expect one Click Activity which is Click OK at the bottom of the form its not working i have tried maximizing the window expecting that the Click Ok activity will be more visible and its still not working

More information would be helpful to answer your question, any errors? Screenshots?