[R-sig-Geo] spatiotemporal co-kriging?

Dear R-sig-geo list members, I am working on a spatio-temporal kriging model (using gstat::krigeST) of two closely related variables. I’m getting good results on one of them, and not so good on the other. Since both dependent variables are inter-related, I expect that co-kringing would be a

[R-sig-Geo] Kriging in gstat - "number of rows in data.frame and SpatialPoints don't match" error

Hi, I have done kriging using gstat a few times before, but this time I keep getting an error and I am unsure what is that the krige() function doesn't like - my spatial pixels or point data frames. Error in validObject(.Object) : invalid class "SpatialPointsDataFrame" object: number of rows