[R] plspm error: Error in solve.qr(qr(X[, blockinds == j]), Z[, j]) :

[mscheb]

Hello there,
I am performing a path analysis using plspm.

I successfully ran one analysis but then tried to rerun with some tweaks of
my data and now am getting this error message:
Error in solve.qr(qr(X[, blockinds == j]), Z[, j]) : 
  singular matrix 'a' in 'solve'

My code is:
> PNS = c(0, 0, 0, 0, 0)
> PND = c(1, 0, 0, 0, 0)
> mothering = c(1, 1, 0, 0, 0)
> controls = c(0, 0, 0, 0, 0)
> behav.diff.47 = c(1, 1, 1, 1, 0)
> second_path = rbind(PNS, PND, mothering, controls, behav.diff.47)
>  
> colnames(second_path) = rownames(second_path)
> innerplot(second_path)
> second_blocks = list(13, 14:17, 19, 2:12, 18)
> second_modes = c("B", "B", "B", "B", "B")
> second_plspm = plspm(steph.data.use.path2, second_path, second_blocks,
> modes = second_modes)

Can anyone help me? 
It seems strange it worked successfully before and now I can't run it when
all I did was omit a few rows.
Any help much appreciated :)



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