Thread Subject: 2d surface plot in comsol with matlab

I have a 2d surface plot calculated in comsol. I am using the postplot command and I would like the to change the z-axis to logarithmic scale. By doing so the image dissapears both if I try to change it in the GUI or if I change "axistype" in the code from 'lin' to 'log'.

Below is the code I am using:

postplot(fem, ...
        'tridata',{'absux_poeq^2','cont','internal'}, ...
        'trimap','winter(1024)', ...
        'flowdata',{'ux','uy'}, ...
        'flowcolor',[1.0,0.0,0.0], ...
        'flowdens','velocity', ...
        'title','Surface: absux_poeq^2 Streamline: grad(u)', ...
        'axistype',{'lin','lin','log'}, ...
        'axis',[0.5,2.5,-2,2, 0.1, 1]);

Any ideas?