After taking a look at your logs, the problem is related to the database. The problem is originating because you either are missing a table or missing a column the code is trying to index. I would take a look at the queries inside of /modules/Abre-Students/student.php as a starting place. Unfortunately, I can’t help too much beyond this point because I am not sure of your structure or the data you are entering.
Let me know if there is anything else I can do to help!