I uploaded the folder that I developed in my machine with my language module (it works).
After, I tried to activate it in Apps Market, in that point Studio displays me the image's error, the log file is about that process.
Is it possible that it could be related to difference between environments? I mean, as I am working locally in Windows and the testing host is in Linux, that may cause errors?
This point looks interesting: "in that point, Studio displays me the image's error ". What info did you get? Usually, there is no big difference between Windows and Linux, possibly only in settings like allow_url_fopen.