Error: Unable to load the requested class: functions

Hello. I’m kinda new to Expression Engine, and am working on my second EE site. The first one was uploaded from my local files by a developer, but now I’m trying to upload my second site by myself.

I’ve followed all of the directions in the User Guide (imported the database, gave the correct permission to files and folders, updated the config.php to match the database, etc). However, I keep getting the following message when trying to access admin.php:

Error: Unable to load the requested class: functions

Now, I pretty sure there’s a begginer’s mistake somewhere. I wonder if anyone can figure out how to solve this?

I’m using core 3.4.3 and the wizard tells me everything is ok on my host to run EE.

Since the client haven’t decided for the domain yet, I’m running it as a subfolder of my portfolio, that is:

http://iconoclasta.com.br/heloee/

any hints?

thanks in advance!

daniel