We can't write anything on the wall.
See attached pic.
Thanks

Hi.

It seems that JomSocial on your site is not installed properly.
There are files loaded from older version.

Please, follow this steps then:

0. Make a safe copy of your whole system (files and database)
1. Browse to Backend -> Extensions -> Extension Manager -> Manage
2. Search all extensions using filter "com"
3. Uninstall all JomSocial related extensions
4. Search all extensions using filter "jom"
5. Uninstall all JomSocial related extensions
6. Download latest JomSocial package from here: www.jomsocial.com/component/digistore/licenses
7. Unzip it
8. Install com_community package via Joomla! installer
9. Follow installation steps
10. Install iJoomla installer for future version check and upgrade.

After that you'll need to do a menu fix also:

When you upgrading JomSocial menu items in JomSocial toolbar lost "connection" with component. Joomla! mark them as disabled and with notice: "Component 'com_community' does not exist". In order to fix it please follow this instruction:

- click on menu item in JomSocial menu in order to edit it
- when in edit mode don't change anything
- save
- menu item should be fixed
- do it for every JomSocial related menu items (if needed) in all other menus