First of all you have to know that the default permission of directories in Ubuntu is 644 which means you can't create a file in a directory you are not the owner.
you are trying as
user:francisco-vergara to create a file in a directory
/home/sixven/camp_sms/inputs which is owned by
So how to solve this:
You can either change the permission of the directory and enable others to create files inside.
sudo chmod -R 777 /home/sixven/camp_sms/inputs
This command will change the permission of the directory recursively and enable all other users to create/modify and delete files and directories inside.
You can change the owner ship of this directory and make
user:francisco-vergara as the owner
sudo chown -R francisco-vergara:francisco-vergara /home/sixven/camp_sms/inputs
But like this the
user:sixven can't write in this folder again and thus you may moving in a circular infinite loop.
So i advise you to use Option 1.
Or if this directory will be accessed by both users you can do the following trick:
change ownership of the directory to
user:francisco-vergara and keep the group owner
sudo chown -R francisco-vergara /home/sixven/camp_sms/inputs
Like that both users can still use the directory.
But as I said you before It's easiest and more efficient to use option 1.