Error

Fatal error: Uncaught TypeError: Unsupported operand types: string - int in /home/brincusc/public_html/views/colegio/error.php:13 Stack trace: #0 /home/brincusc/public_html/libs/view.php(10): require() #1 /home/brincusc/public_html/controllers/colegio.php(745): View->render('colegio/error') #2 /home/brincusc/public_html/libs/app.php(39): Colegio->error(Array) #3 /home/brincusc/public_html/index.php(11): App->__construct() #4 {main} thrown in /home/brincusc/public_html/views/colegio/error.php on line 13