Just happened the same to me, drove me crazy the free nights of a whole week.
Allso a newbie in CodeIgniter and using Linux Mint 17.2
Instructions and tutoriasl are very well done for the grocery crud , so simple.....
Tried one, two ... six .... dann!
Was thinking what I had done wrong and going to bed totaly frustrated
After the fourth night I searched for some other CodeIgniter tutorials but this time without using GroceryCrud and found
that were allso very clean and well done.
When I started to do the (super simple) exercises of lection one it did not work !!!
That was the moment when I decided to switch to CodeIgniter 2.2.2 and for my surprise it worked not only
with the exercises but GroceryCrud did allso work fine.
Jus to be completely shure I did a totaly fresh download and instal of CI 3.0.0 and the super simple example
of lection 1 in "codeigniter from scratch" didnt want to work.
So I signed in at the CI site and after looking arround the forum a little bit found a note that said:
" Starting with CodeIgniter 3.0, all class filenames (libraries, drivers, controllers and models) must be named in a Ucfirst-like manner or in other words - they must start with a capital letter. CodeIgniter User Guide"
So changed the name of the class of my super simple example to have first letter in capital first and BINGO !
After that I installed GroceryCrud in CI 3.0.0 and it still did not want to go.
Renamed file /applications/controller/examples.php to /applications/controller/Examples.php and edited it to put the name
of the main class from "class examples extends CI_Controller" to "class Examples extends CI_Controller"
Now it partialy worked but complained that it did not find the Grocery_crud_modell so I renamed allso
applications/modells/grocery_crud_models.php to applications/modells/Grocery_crud_models.php
and now all seems to work fine for GroceryCrud 1.5.1 in CodeIgniter 3.0.0
Hope it Helps !!