when you are getting error messages saying there is more than one element found then it is probable that you have unchecked 'visible' and 'screen visible' attributes, maybe your problem will get rectified if you set those attributes as true.
Another way to approach this would be to use 'Match index' and 'ordinal' to see if you are missing something, basically you just need to tell the application modeler which item is to be used if there are multiple visible items which are similar