Thanks @ManosAngelidis. It is correctly set now.
Finally, we are trying to export our experiment from another computer with an older NRP version (october/2017) to my fresh installation. We have copied the experiment folder in the new installation.
However it gets stuck on loading the experiment (Loading sky box) because it cannot find some texture files (sky/blur/blur-*.jpg). The error at the web console is as follows:
GET http://localhost:8080/assets/sky/img/3denv/sky/blur/blur/img/3denv/sky/blur/blur-pz.jpg 404 (Not Found)
Our experiment is a modification of the iCub visual tracking experiment (using the same environment but with different brain model and transfer functions). The example iCub visual tracking experiment runs with no issue.
I have checked that those texture files can be found and accessed in /Models/sky/blur/. I have found where those files are reference with no luck. Do you have any idea where I should look at?