Error: Could not load model total/cod_fee!

I'm having this error and don't know what's cousing it :s
It appears after I select the payment method and press the button to continue to the checkout link.

Can anyone help me.

This is because you installed the "COD FEE" mod at one point then deleted the files but didn't delete it from the admin first. Now it is stuck in the database.

Try this:
goto phpmyadmin
execute this in the sql window Change "oc_" to your prefix or remove it if not using a prefix

Thanks a lot man!!
You are a saver!!!
Just had to change the extensions that you wrote for extension

Thanks again!