traceback in web side while installing some modules

Install all main apps :

Uncaught Error: Got non-search view after asking for a search view: type search, arch root form
http://localhost:8069/web/webclient/js:27995

2012-02-13 08:09:34,987 2664 INFO ? werkzeug: 127.0.0.1 - - [13/Feb/2012 08:09:34] "GET /web/webclient/css?mods=account_voucher,hr_evaluation,account_asset,account_accountant,hr_payroll,project_gtd,hr_holidays,purchase,hr,project_issue,hr_expense,mrp,hr_recruitment,project,hr_timesheet_sheet,crm,point_of_sale HTTP/1.1" 200 -
2012-02-13 08:09:35,064 2664 ERROR ? openerp.addons.web.common.http.HttpRequest.dispatch: An error occurred while handling a json request
Traceback (most recent call last):
  File "/home/aline/source/web/trunk/addons/web/common/http.py", line 260, in dispatch
    r = method(controller, self, **self.params)
  File "/home/aline/source/web/trunk/addons/web/controllers/main.py", line 252, in qweb
    last_modified = self.get_last_modified(files)
  File "/home/aline/source/web/trunk/addons/web/controllers/main.py", line 167, in get_last_modified
    for f in files)
ValueError: max() arg is an empty sequence