[Plugin: Advanced Custom Fields] Image path is not showing

hello, i am trying to call the image path but its not getting the path as i followed the instruction provided on the site please kindly help me my code is like this

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i want to call the epaper images with loop. and if any of the image get clicked then its big or preview will be open in the full-epaper image.

please help me.

http://wordpress.org/extend/plugins/advanced-custom-fields/