Biophysical parameters bands not creating an image

Hello guys, I resampled 4 sentinel-2 L2A image tiles, subset them and further carried out biophysical processing before mosaicking the tiles into an image. my problem is, when I try to view the rgb image of the biophysical product for both the mosaicked image and subset products, it gives me an error that image cannot be created. in some cases it says ‘border colour’ value has to be added.