You’re right the slash was missing. But I think that I was looking for the file in the wrong place too. I replaced app. SamplesFolder for project.folder and it’s working now.
Thank a lot for the help. I have another issue that maybe you can also help me!
I saw in a tutorial that, for example, if I´m using a Movie File In TOP and upload the file I can see the pathway and then if I click in the little plus symbol that is on the left I can see the expression of its location. But in my case I just can see the constant. When I click on the little square that is for expression it changes to the banana file again.
Anyway to solve this? Or any reason for this happens? Hope that I had expressed myself well. I´m really a Touchdesigner and Phyton noob any help or tips are very welcome.