You know, in the case when you do the development with your username \myusername but the process run in \robotusername , it´s necessary to saving these files into C:\ , because robot doesn´t have permissions to works with files saved in myusername\documents , so in this case i need to ask server administator to do the access for robot in my folder.
Its very weird and it will be great, if someone from UiPath is going to see this Topic and resolve this. Also the error is shitty 
But thanks mahmoud.