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Cannot modify header information - headers already sent...(Private Messages module)

Hello everybody, i'm new to drupal but i'm an old user of all the cms. I've just installed the module Private Messages for version 4.7 and i get one php error at the administration panel.

Cannot modify header information - headers already sent by (output started at /home/djmk/public_html/modules/privatemsg/privatemsg.module:1) at /home/djmk/public_html/includes/common.inc στη γραμμή 266.

I didn't change anything at the module's files.

Ps. I wish i wrote everything ok...(And sorry for my english!!)

adding user classes/types

I want to either create a new module or hack the current one to allow users to have a type/class.
Registration will have different options depending on the class of the user.
Different classes will also be able to see slightly different data in drupal.

Can anyone suggest some starting points?
Is there a module that does something similar? Is there a way to extend & override the built-in user module?

My wishlist

I've recently started to use Drupal and my experience with it have been very good so far. I like the thin core, the admin panel, taxanomy and the modules available(such as taxonomy_menu and adsense etc).

However, there's some modules that I need but havn't found yet.

[ LINKS MODULE ] Error

Hi ,
when i try to go to the modules section after my links package_module installation i get the following error:
Fatal error: Call to undefined function: module_exists() in V:\Core\htdocs\drupal\modules\links\links.module on line 15
Any ideas about that?

Thanks
Panos

[ecommerce] Add thumbnail field to cart/view in case of image node

Hello,

I would like to add the possibility of adding a thumbnail to cart/view when the node is an image (added in turn to the store).

I know a bit of PHP and CSS, but I am new to drupal, so I would need some assistance on where exactly and how I could achieve this. Some hint to point me in the right direction would already be helpful.

User paths patch for the pathauto.module

I have made a patch for 4.7.0 (pathauto_user.inc,v 1.12.2.1 2006/08/30 20:29:16) which allows to automatically create, update and delete aliases for the user settings pages, user contact and tracker pages if these modules are turned on. These patch delete tracker form from pathauto settings because tracker, contact and edit aliases will be created automatically from pattern of user path settings.

For example:

We have pattern for user account page paths:
user/[user]

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