added exception handling
added exception handling

EarthSystemCoG/COG,EarthSystemCoG/COG,EarthSystemCoG/COG,sashakames/COG,sashakames/COG,EarthSystemCoG/COG,sashakames/COG,EarthSystemCoG/COG,EarthSystemCoG/COG,sashakames/COG,sashakames/COG,EarthSystemCoG/COG,sashakames/COG,sashakames/COG