How to build an attribute table in a 3-band raster?

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I have a 3-band (RGB) raster file from CORINE and the attribute table hasn't been built. When I try to execute the command BuildRasterAttributeTable I get an error that only single band rasters are allowed. What should I do to get the attribute with the land uses?

Error Message:

ERROR 000423 Only single band integer raster dataset is a valid input


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