我在使用 likfit 时做错了什么？

Question

Error in solve.default(v$varcov, xmat) : 
  Lapack routine dgesv: system is exactly singular: U[22,22] = 0
Además: Warning message:
In varcov.spatial(dists.lowertri = get(".likGRF.dists.vec", envir = .geoR.env)[[i]],  :
  Two or more pairs of data at coincident (or very close) locations. 
This may cause crashes in some matrices operations.

在定义时

var.mv_mar<-likfit(dG_mar, ini=c(3037, 24869),nug=0.000)

我正在研究风参数，dG_mar 是这样定义的

dG_mar<-as.geodata(datos,coords.col=2:3, data.col=7)
 show(dG_mar)
  head(dG_mar)
   dG_mar$borders<-as.data.frame(Cuenca_Cajamarca, borders=T)
plot(dG_mar, low=T)
points(dG_mar)

过去一周我到底做错了什么？ 尝试了 diff cov.models、kappas 和 nuggets。