Error using ==> evalin

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

What’s your operating system?