Expression Evaluation Error

HI I'm getting an error while creating a form 

Could not display interface. Please check definition and inputs. Interface Definition: Expression evaluation error at function a!imageField [line 60]: The image at index 1 in an image gallery component [label=""] has an invalid value for "document". "document" must not be null.

Please help me

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  • Thank you Ujjwal your code helped me to clear my error  

    But 1 problem getting this error in process variable I've tried multiple times but not able to rectify this error

      ERROR An error occurred while evaluating expression: =localize("de","","fr_CA","","ru","","sv","","pt","","ko","","el","","it","","fr_FR","","es","","ar","","zh_HK","","en_GB","","en_US",tostring(rule!AX_NewVehicleDisplayName(cancel: pv!cancel, vehicle: pv!vehicle)),"ja","","es_MX","","zh_CN","","pl","","nl","") (Expression evaluation error in rule 'ax_newvehicledisplayname': )