Post installation

Hello
I have problems.
I add new modules "forum" in administer -> modules.
Next want configure this module in administer -> forum
then site show me:
Fatal error: Call to undefined function: taxonomy_get_tree() in /home/user/public_html/catalog/modules/forum.module on line 575

I need change this error, what i must make ?
I have 4.7.3 version
Please answear
Best regards

Ps. Sorry, my english is not perfect

I look the table users in database and the field "data" in "users" table have's a satranger format.

Something as: a:3:{s:6:"notify";i:0;s:14:"picture_delete";i:0;s...

How I can translate this field?

if I post in my drupal forum with a registered_user
the post is blank,
and the forum category have blank page,
but with an administrator login I see all post correctly

the permission of forum are correct -> allow_post enable

:-(

Hi all :)

I'm using Drupal here in Italy to implement a news(paper) website. The editor however would like me to extend the info related to users, especially those in the "author" profile. I should add fields like the person's real name, address, and so on.

Is it possible to make such a heavy modification to Drupal?

Is there some other strategy I could follow that would be equally effective?

Thanks for your help.

Rock

I am having trouble transfering ownership of a node (that I created with ContentO) to another user. I used ContentO to create another content type. I have given the user permission to edit their own content. I made them the author. When logged in as the other user, viewing the content (with them listed as the owner) the edit tab is not available. Anyone have any thoughts?

Thanks

Rich
(rl)

can anyone help with this?

things were working fine, then I installed another module (forget which one it was now that triggered this)
and now I get the following error message when creating any new content item: