This is better because now you see that it try to execute the script but has not enough permission.
Several possibilities:
- You perform a chmod 777 on the directory and the files that solve the problem. In this case this may be due to a problem of owner and group of the file
- You have defined a new domain in your hosting server and have not provided the permission to execute script. Some hosting provider require that you setup it to allow the execution of scripts. Compare the setting with another domain that work.