NDVI Error -Returning -999 no data error

I have been trying to run NDVI in TerrSet 18.1 I keep getting the error 'Unexpected error, check the integrity of your data...' when l open the notepad file returned by the software after a failed NDVI attempt it says 'Vegindex Error -999' which means the no data value is set at -999. I have tried to set it at 0 but still the software gives me the -999 error. Please help





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