[R] Error in `row.names<-.data.frame`(`*tmp*`, value = c("1.9", "1.9", "1.9", : duplicate 'row.names' are not allowed

[sandoz at free.fr]

 Hi,
Can someone explain this error below,
I don't understand why the 2 int columns are associated to make a row name

> horse1.data<-read.csv("cte2.csv", header=TRUE, sep=";")
> h1.dat<-mlogit.data(data=horse1.data,choice="win",chid.var="raceid",alt.var="nbChev",shape="long")
Error in `row.names<-.data.frame`(`*tmp*`, value = c("1.9", "1.9", "1.9",  :
  duplicate 'row.names' are not allowed
In addition: Warning message:
non-unique values when setting 'row.names': ‘1.9’, ‘2.17’

> head(horse1.data,27)
   raceid nbChev  cteD cteTh win
1       1      9  29.6  23.8  no
2       1      9   5.3   6.7  no
3       1      9  10.9  11.5  no
4       1      9   8.2   6.7 yes
5       1      9  17.8  18.2  no
6       1      9  26.0  30.0  no
7       1      9   4.4   5.7  no
8       1      9   4.9   6.0  no
9       1      9   4.5   6.9  no
10      2     17  32.1  48.3  no
11      2     17   8.8  24.5  no
12      2     17  36.7  18.3  no
13      2     17   6.7  11.8 yes
14      2     17  10.3  12.8  no
15      2     17  61.6  68.5  no
16      2     17   2.5   6.7  no
17      2     17  27.7  30.9  no
18      2     17   8.4  10.5  no
19      2     17  56.5  40.7  no
20      2     17  95.5  11.9  no
21      2     17  12.7   6.4  no
22      2     17  19.6  14.2  no
23      2     17 269.6  67.2  no
24      2     17 300.0  75.6  no
25      2     17 300.0 114.3  no
26      2     17  36.3  16.9  no

> str(horse1.data)
'data.frame':        26 obs. of  5 variables:
 $ raceid: int  1 1 1 1 1 1 1 1 1 2 ...
 $ nbChev: int  9 9 9 9 9 9 9 9 9 17 ...
 $ cteD  : num  29.6 5.3 10.9 8.2 17.8 26 4.4 4.9 4.5 32.1 ...
 $ cteTh : num  23.8 6.7 11.5 6.7 18.2 30 5.7 6 6.9 48.3 ...
 $ win   : Factor w/ 2 levels "no","yes": 1 1 1 2 1 1 1 1 1 1 ...

below the .csv file url for those willing to reproduce the error
https://www.dropbox.com/s/wv7nq8tk9k87le5/cte2.csv?dl=0

sandoz