Is it a large dataset? When I download large datasets through the OpenData API, I usually get a "Processing" answer back and I will have to reload multiple times before I actually get a valid answer. Copy and paste the OpenData API URL into your browser's address bar and load it. Do you immediately get all the data or do you get a "Processing" message?
Thank you Ruben, yes it is very large data set, this is the link of our data, http://opendata.arcgis.com/datasets?q=Parcels+Registered+-+WestBank+%28%D9%82%D8%B7%D8%B9+%D8%A7%D9%...
could you please try it and you will find that the download file is empty.