Group comparison

[JDavies95]

Hi, I am trying to do the analyse comparing disease to control but i keep receiving this error:

R[write to console]: Error in prcomp.default(all_both, center = TRUE, scale = TRUE) : cannot rescale a constant/zero column to unit variance

Error in prcomp.default(all_both, center = TRUE, scale = TRUE) : cannot rescale a constant/zero column to unit variance

Any advice on what I may be doing wrong?

Thanks!