Show warnings or errors when installing a module

[vblanch]

Hi all,

I'm developing a new module and I copy some files from the module to /mails. I want to show a warning if the files already exists (so the user knows that files haven't been copied).

 

The problem is that I can't find a way to show warnings or errors in Prestashop. I'm using 1.5.4.

 

So far I tried this:

 

                $this->warning = $this->l('just a warning ');

                $this->context->controller->errors[] = 'give an error regardless';

 

So if somebody knows how to show warnings or errors or any kind of messages in the install() function please let me know.

 

Thanks!!

 

P.D. Sorry if this has been asked before, just can't find the answer!