AttributeError: 'Chrome' object has no attribute 'add_wiki_toolbars'

[crossroad]

When I try to map the interface "Manage Component / Mapping Projects" for the menu "Components" section "Manage Project" I get the following error:

AttributeError: 'Chrome' object has no attribute 'add_wiki_toolbars'

the detail of the error is:

File "/usr/local/lib/python2.7/dist-packages/Trac-0.11.7-py2.7.egg/trac/web/main.py", line 450, in _dispatch_request
  dispatcher.dispatch(req)
File "/usr/local/lib/python2.7/dist-packages/Trac-0.11.7-py2.7.egg/trac/web/main.py", line 206, in dispatch
  resp = chosen_handler.process_request(req)
File "/usr/local/lib/python2.7/dist-packages/Trac-0.11.7-py2.7.egg/trac/admin/web_ui.py", line 114, in process_request
  path_info)
File "/usr/local/lib/python2.7/dist-packages/SimpleMultiProject-0.0.3dev_r12068-py2.7.egg/simplemultiproject/admin_component.py", line 90, in render_admin_panel
  Chrome(self.env).add_wiki_toolbars(req)

Trac: 0.11.7
Python: 2.7.3rc2 (default, Apr 22 2012, 22:30:17) [GCC 4.6.3]

[falkb]

(In [12999]) blindly tried backport to Trac 0.11, I don't have it installed, please report back (refs #10515, refs #10240, refs #10078)

[falkb]

Steffen, once we talked about this: could you try a test run of this issue with your 0.11 Trac, please? TIA