I have recently deleted the Psychopy standalone file from the Applications folder. Believing that psychopy was uninstalled from my computer I moved back to spyder and I tried to lunch the psychopy experiment and it worked, probing that I was wrong and psychopy is still installed. So that seems to indicate that I had two different copies of Psychopy in my computer, one that corresponded to the deleted file and other which might be the libraries in my anaconda folders.