[R] Holt-Winters problem

[Przemek Gawin]

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This post was updated on Jul 26, 2013; 4:40pm.
Hello,

Two days ago I started my journey with R, and right now I'm struck on
Holtwinters, and have no idea, what I'm doing wrong. So now, I'll show
step by step what I've been doing. Actually it is a part of "Introducy
Time Series with R".

1) I download data from
http://www.massey.ac.nz/~pscowper/ts/motororg.dat due to port
blockage. Save it as motororg.txt

2) Inserting this code:
Motor.dat <- read.table("motororg.txt", header = T)
attach(Motor.dat)
Comp.hw1 <- HoltWinters(complaints, beta = 0, gamma = 0)

3) Baang! Error here.
"Error in decompose(ts(x[1L:wind], start = start(x), frequency = f),
seasonal) :
 time series has no or less than 2 periods"

4) Actually it has, and I turned it on with attach command?

Motor.dat
   complaints
1          27
2          34
3          31
4          24
5          18
6          19
7          17
8          12
9          26
10         14
11         18
12         33
13         31
14         31
15         19
16         17
17         10
18         25
19         26
20         18
21         18
22         10
23          4
24         20
25         28
26         21
27         18
28         23
29         19
30         16
31         10
32         24
33         11
34         11
35         13
36         27
37         18
38         20
39         21
40          6
41          9
42         29
43         12
44         19
45         14
46         19
47         16
48         23

Can you tell me what I am doing wrong?

PS

I tried to make complaints.ts as well but I didn't work either.