bode, "arguments must be scalars" error

[Guido Mureddu]

Hello, I'm not sure whether this is the correct place to post this, so excuse me if it isn't. I'm currently using Octave 2.1.73, on Linux. I'm trying to get the bode plot of the simple transfer function 1/s.
I try to accomplish this in this way:

| octave:1> G = tf(1, [1 0])
| octave:2> sysout(G)
| Input(s)
|       1: u_1
| 
| Output(s):
|      1: y_1
| 
| transfer function form:
| 1
| ---------
| 1*s^1 + 0

Which seems to be correct. However, when I try to plot it using the bode function, it produces this error:

| octave:3> bode(G)
| error: logspace: arguments must be scalars
| error: evaluating if command near line 85, column 3
| error: called from `logspace' in file `/usr/local/share/octave/2.1.73/m/general/logspace.m'
| error: evaluating assignment _expression_ near line 78, column 9
| error: evaluating if command near line 67, column 5
| error: called from `__freqresp__' in file `/usr/local/share/octave/2.1.73/m/control/base/__freqresp__.m'
| error: called from `__bodquist__' in file `/usr/local/share/octave/2.1.73/m/control/base/__bodquist__.m'
| error: called from `bode' in file `/usr/local/share/octave/2.1.73/m/control/base/bode.m'

What am I doing wrong? My Linux distribution (Ubuntu 6.06) has a precompiled package of Octave 2.1.72, so I removed it and compiled 
2.1.73 hoping it would solve it, but unfortunately, no such luck.

Thanks for your help,

Guido Mureddu