cannot concatenate 'str' and 'lxml.etree._LogEntry' objects

When developing I made a mistake and got the following error:

[2009-08-14 15:07:08,315] ERROR:web-services:[01]: Environment Information :
[2009-08-14 15:07:08,316] ERROR:web-services:[02]: PlatForm : Linux-2.6.26-2-xen-686-i686-with-debian-squeeze-sid
[2009-08-14 15:07:08,317] ERROR:web-services:[03]: Operating System : posix
[2009-08-14 15:07:08,318] ERROR:web-services:[04]: Operating System Release : 2.6.26-2-xen-686
[2009-08-14 15:07:08,319] ERROR:web-services:[05]: Operating System Version : #1 SMP Sun Jun 21 09:15:17 UTC 2009
[2009-08-14 15:07:08,320] ERROR:web-services:[06]: Operating System Architecture : 32bit
[2009-08-14 15:07:08,321] ERROR:web-services:[07]: Operating System Locale :
[2009-08-14 15:07:08,324] ERROR:web-services:[08]: Python Version : 2.5.4
[2009-08-14 15:07:08,325] ERROR:web-services:[09]: OpenERP-Server Version : 5.0.1
[2009-08-14 15:07:08,326] ERROR:web-services:[10]: Last revision No. & ID : Traceback (most recent call last):
[2009-08-14 15:07:08,326] ERROR:web-services:[11]: File "/project/openobject-server-5.0/bin/osv/osv.py", line 57, in wrapper
[2009-08-14 15:07:08,327] ERROR:web-services:[12]: if not pooler.get_pool(dbname)._ready:
[2009-08-14 15:07:08,328] ERROR:web-services:[13]: File "/project/openobject-server-5.0/bin/pooler.py", line 81, in get_pool
[2009-08-14 15:07:08,329] ERROR:web-services:[14]: pool = get_db_and_pool(db_name, force_demo, status, update_module)[1]
[2009-08-14 15:07:08,330] ERROR:web-services:[15]: File "/project/openobject-server-5.0/bin/pooler.py", line 40, in get_db_and_pool
[2009-08-14 15:07:08,331] ERROR:web-services:[16]: addons.load_modules(db, force_demo, status, update_module)
[2009-08-14 15:07:08,332] ERROR:web-services:[17]: File "/project/openobject-server-5.0/bin/addons/__init__.py", line 728, in load_modules
[2009-08-14 15:07:08,333] ERROR:web-services:[18]: r = load_module_graph(cr, graph, status, report=report)
[2009-08-14 15:07:08,334] ERROR:web-services:[19]: File "/project/openobject-server-5.0/bin/addons/__init__.py", line 618, in load_module_graph
[2009-08-14 15:07:08,335] ERROR:web-services:[20]: tools.convert_xml_import(cr, m, fp, idref, mode=mode, **kwargs)
[2009-08-14 15:07:08,336] ERROR:web-services:[21]: File "/project/openobject-server-5.0/bin/tools/convert.py", line 879, in convert_xml_import
[2009-08-14 15:07:08,337] ERROR:web-services:[22]: logger.notifyChannel('init', netsvc.LOG_ERROR, relaxng.error_log.last_error)
[2009-08-14 15:07:08,340] ERROR:web-services:[23]: File "/project/openobject-server-5.0/bin/netsvc.py", line 174, in notifyChannel
[2009-08-14 15:07:08,341] ERROR:web-services:[24]: msg = common().get_server_environment() + msg
[2009-08-14 15:07:08,342] ERROR:web-services:[25]: TypeError: cannot concatenate 'str' and 'lxml.etree._LogEntry' objects

The following patch fixes it for me:

=== modified file 'bin/netsvc.py'
--- bin/netsvc.py 2009-07-07 10:02:07 +0000
+++ bin/netsvc.py 2009-08-14 13:16:44 +0000
@@ -171,7 +171,7 @@
             msg = tools.exception_to_unicode(msg)

         if level in (LOG_ERROR,LOG_CRITICAL):
- msg = common().get_server_environment() + msg
+ msg = common().get_server_environment() + str(msg)

         result = tools.ustr(msg).strip().split('\n')
         if len(result)>1:

And then I get a proper error:

[2009-08-14 15:10:40,155] ERROR:init:[01]: Environment Information :
[2009-08-14 15:10:40,155] ERROR:init:[02]: PlatForm : Linux-2.6.26-2-xen-686-i686-with-debian-squeeze-sid
[2009-08-14 15:10:40,155] ERROR:init:[03]: Operating System : posix
[2009-08-14 15:10:40,156] ERROR:init:[04]: Operating System Release : 2.6.26-2-xen-686
[2009-08-14 15:10:40,156] ERROR:init:[05]: Operating System Version : #1 SMP Sun Jun 21 09:15:17 UTC 2009
[2009-08-14 15:10:40,156] ERROR:init:[06]: Operating System Architecture : 32bit
[2009-08-14 15:10:40,156] ERROR:init:[07]: Operating System Locale :
[2009-08-14 15:10:40,156] ERROR:init:[08]: Python Version : 2.5.4
[2009-08-14 15:10:40,156] ERROR:init:[09]: OpenERP-Server Version : 5.0.1
[2009-08-14 15:10:40,157] ERROR:init:[10]: Last revision No. & ID : /project/modules/test/test_view.xml:36:0:ERROR:RELAXNGV:RELAXNG_ERR_ATTRVALID: Element wizard failed to validate attributes
Traceback (most recent call last):
  File "openobject-server-5.0/bin/openerp-server.py", line 111, in <module>
    pooler.get_db_and_pool(db, update_module=tools.config['init'] or tools.config['update'])
  File "/project/openobject-server-5.0/bin/pooler.py", line 40, in get_db_and_pool
    addons.load_modules(db, force_demo, status, update_module)
  File "/project/openobject-server-5.0/bin/addons/__init__.py", line 728, in load_modules
    r = load_module_graph(cr, graph, status, report=report)
  File "/project/openobject-server-5.0/bin/addons/__init__.py", line 618, in load_module_graph
    tools.convert_xml_import(cr, m, fp, idref, mode=mode, **kwargs)
  File "/project/openobject-server-5.0/bin/tools/convert.py", line 875, in convert_xml_import
    relaxng.assert_(doc)
  File "lxml.etree.pyx", line 2669, in lxml.etree._Validator.assert_ (src/lxml/lxml.etree.c:99559)
AssertionError: Element wizard failed to validate attributes, line 36