I started a v8 installation in a virtual machine to start some module development and generally look at what's new in v8. Everything was going ok, I was installing various core modules to get things fleshed out and then I got an Internal Error:

Internal Server Error

The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.

I went to the logs and this is the recent output. I'm running Ubuntu 12.04 LTS, v8 dev-20140325-000101 in Hyper-V.

I haven't 'lost' any data really, just a couple of demo users I chucked in, but I was wondering what has caused the error.

2014-03-26 17:06:45,241 1153 INFO ? openerp: OpenERP version 8.0dev-20140325-000101
2014-03-26 17:06:45,242 1153 INFO ? openerp: addons paths: ['/opt/openerp/.local/share/OpenERP/addons/8.0', u'/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/addons', '/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/addons']
2014-03-26 17:06:45,242 1153 INFO ? openerp: database hostname: localhost
2014-03-26 17:06:45,242 1153 INFO ? openerp: database port: 5432
2014-03-26 17:06:45,242 1153 INFO ? openerp: database user: openerp
2014-03-26 17:06:45,898 1153 INFO ? openerp.service.server: HTTP service (werkzeug) running on 0.0.0.0:8069
2014-03-26 17:07:21,934 1153 INFO ? openerp.http: HTTP Configuring static files
2014-03-26 17:07:22,321 1153 INFO [Company name was here] openerp.modules.loading: loading 1 modules...
2014-03-26 17:07:23,705 1153 INFO [Company name was here] openerp.modules.loading: loading 128 modules...
2014-03-26 17:07:25,988 1153 INFO [Company name was here] openerp.modules.loading: Modules loaded.
2014-03-26 17:07:26,046 1153 INFO [Company name was here] openerp.addons.base.ir.ir_http: Generating routing map
2014-03-26 17:07:26,381 1153 INFO [Company name was here] werkzeug: 141.101.98.179 - - [26/Mar/2014 17:07:26] "GET / HTTP/1.1" 500 -
2014-03-26 17:07:26,451 1153 ERROR [Company name was here] werkzeug: Error on request:
Traceback (most recent call last):
  File "/usr/share/pyshared/werkzeug/serving.py", line 159, in run_wsgi
    execute(app)
  File "/usr/share/pyshared/werkzeug/serving.py", line 146, in execute
    application_iter = app(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/service/server.py", line 261, in app
    return self.app(e, s)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/service/wsgi_server.py", line 362, in application
    return application_unproxied(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/service/wsgi_server.py", line 348, in application_unproxied
    result = handler(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/http.py", line 1094, in __call__
    return self.dispatch(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/http.py", line 1071, in __call__
    return self.app(environ, start_wrapped)
  File "/usr/share/pyshared/werkzeug/wsgi.py", line 411, in __call__
    return self.app(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/http.py", line 1231, in dispatch
    result = ir_http._dispatch()
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/addons/website/models/ir_http.py", line 64, in _dispatch
    return super(ir_http, self)._dispatch()
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/addons/base/ir/ir_http.py", line 108, in _dispatch
    processing = self._postprocess_args(arguments, rule)
TypeError: _postprocess_args() takes exactly 2 arguments (3 given)
2014-03-26 17:07:38,002 1153 INFO [Company name was here] werkzeug: 141.101.98.179 - - [26/Mar/2014 17:07:38] "GET / HTTP/1.1" 500 -
2014-03-26 17:07:38,008 1153 ERROR [Company name was here] werkzeug: Error on request:
Traceback (most recent call last):
  File "/usr/share/pyshared/werkzeug/serving.py", line 159, in run_wsgi
    execute(app)
  File "/usr/share/pyshared/werkzeug/serving.py", line 146, in execute
    application_iter = app(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/service/server.py", line 261, in app
    return self.app(e, s)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/service/wsgi_server.py", line 362, in application
    return application_unproxied(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/service/wsgi_server.py", line 348, in application_unproxied
    result = handler(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/http.py", line 1094, in __call__
    return self.dispatch(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/http.py", line 1071, in __call__
    return self.app(environ, start_wrapped)
  File "/usr/share/pyshared/werkzeug/wsgi.py", line 411, in __call__
    return self.app(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/http.py", line 1231, in dispatch
    result = ir_http._dispatch()
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/addons/website/models/ir_http.py", line 64, in _dispatch
    return super(ir_http, self)._dispatch()
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0dev_20140325_000101-py2.7.egg/openerp/addons/base/ir/ir_http.py", line 108, in _dispatch
    processing = self._postprocess_args(arguments, rule)
TypeError: _postprocess_args() takes exactly 2 arguments (3 given)