Help with dudi.pca

 > coinertia(op.dudi, em3.dudi) 

    Error in paste("COCA", 1:n.axes, sep = " ") : element 2 is empty;

Dear R-helpers,

I have two data frames, op and em4:

 > str(op)

'data.frame':	37 obs. of  5 variables:
  $ m    : num  0.202 0.336 0.122 0.139 0.14 ...
  $ lln  : num  0.798 0.643 0.863 0.835 0.823 ...
  $ rrn  : num  0.789 0.702 0.894 0.895 0.923 ...
  $ asym2: num  0.177 0.304 0.108 0.187 0.274 ...
  $ asym3: num  0.0755 0.0975 0.0818 0.0651 0.13 ...

 > str(rownames(op))

  chr [1:37] "abov-belw" "ampl-rstr" "angl-rndd" "ascn-dscn" ...

 > str(em3)

'data.frame':	37 obs. of  9 variables:
  $ B--: int  4 1 12 14 0 3 2 15 3 5 ...
  $ P--: int  4 1 2 3 5 15 1 0 3 1 ...
  $ U--: int  10 16 4 1 13 0 15 3 12 12 ...
  $ --B: int  5 13 10 15 6 1 5 16 5 8 ...
  $ --P: int  6 2 5 2 12 16 5 0 13 10 ...
  $ --U: int  7 3 3 1 0 1 8 2 0 0 ...
  $ -N-: int  0 2 11 0 17 0 1 0 14 3 ...
  $ -P-: int  15 0 2 16 0 2 2 16 0 0 ...
  $ -R-: int  3 16 5 2 1 16 15 2 4 15 ...

 > str(rownames(em3))

  chr [1:37] "abov-belw" "ampl-rstr" "angl-rndd" "ascn-dscn" "asym- 
symm" "end-bgnn" ...

Thus the 37 rownames in both are the same.

Now I do a pca of op:

 > (op.dudi <- dudi.pca(op, scale = F, scan = F))

Duality diagramm
class: pca dudi
$call: dudi.pca(df = op, scale = F, scannf = F)

$nf: 2 axis-components saved
$rank: 5
eigen values: 0.09233 0.03109 0.01322 0.002024 0.0001017
   vector length mode    content
1 $cw    5      numeric column weights
2 $lw    37     numeric row weights
3 $eig   5      numeric eigen values

   data.frame nrow ncol content
1 $tab       37   5    modified array
2 $li        37   2    row coordinates
3 $l1        37   2    row normed scores
4 $co        5    2    column coordinates
5 $c1        5    2    column normed scores
other elements: cent norm

and of em3

 > (em3.dudi <- dudi.pca(em3, scale = F, scan = F))

Duality diagramm
class: pca dudi
$call: dudi.pca(df = em3, scale = F, scannf = F)

$nf: 2 axis-components saved
$rank: 6
eigen values: 105.5 80.73 55.08 24.06 8.83 ...
   vector length mode    content
1 $cw    9      numeric column weights
2 $lw    37     numeric row weights
3 $eig   6      numeric eigen values

   data.frame nrow ncol content
1 $tab       37   9    modified array
2 $li        37   2    row coordinates
3 $l1        37   2    row normed scores
4 $co        9    2    column coordinates
5 $c1        9    2    column normed scores
other elements: cent norm


I would like to do a coinertia analysis between the two results.

 > coinertia(op.dudi, em3.dudi)

Error in paste("COCA", 1:n.axes, sep = " ") : element 2 is empty;
    the part of the args list of ':' being evaluated was:
    (1, n.axes)

 > coinertia(op.dudi, em3.dudi, n.axes = 2)

Error in sqrt(Dp) : Non-numeric argument to mathematical function

Can anyone tell me why the coinertia fails, and how to fix it? I would  
be happy to send the two data files, if you were willing to help.

Thanks,

MK