Error using ==> evalin

[padulla]

Hi,
I'm trying to run the example 1 and the following message appears

>> dynare example1.mod

Configuring Dynare ...
[mex] Generalized QZ.
[mex] Sylvester equation solution.
[mex] Kronecker products.
[mex] Sparse kronecker products.
[mex] Bytecode evaluation.
[mex] k-order perturbation solver.
[mex] k-order solution simulation.

Starting Dynare (version 4.2.4).
Starting preprocessing of the model file ...
Found 6 equation(s).
Evaluating expressions...done
Computing static model derivatives:
- order 1
Computing dynamic model derivatives:
- order 1
- order 2
Processing outputs ...done
Preprocessing completed.
Starting MATLAB/Octave computing.

??? Error using ==> evalin
Undefined function or variable 'example1'.

Error in ==> dynare at 120
evalin('base',fname) ;

Does anyone have any idea what could be?
I'm with version 4.2.4 of dynare and my matlab version is 7 (2010b)

Many thank's

[HoutanBastani]

What's your operating system?