Can't print report in openerp-web client

Binary package hint: openerp-server

I am using python 2.5, openerp 5.0.3 (from official site). I am having the problem generating the report of Sales Order and Quotation in opernerp-web client. However the openerp-gtk client works okay. (openerp-web is the one causing the problem)

This is the error message that I get:

  File "/usr/lib/python2.5/site-packages/openerp_web-5.0.3-py2.5.egg/openerp/rpc.py", line 350, in execute
    return self.gateway.execute(obj, method, *args)
  File "/usr/lib/python2.5/site-packages/openerp_web-5.0.3-py2.5.egg/openerp/rpc.py", line 154, in execute
    return self.__execute(obj, method, args)
  File "/usr/lib/python2.5/site-packages/openerp_web-5.0.3-py2.5.egg/openerp/rpc.py", line 143, in __execute
    raise common.error(_('Application Error!'), str(e))
  File "/usr/lib/python2.5/site-packages/openerp_web-5.0.3-py2.5.egg/openerp/common.py", line 72, in error
    raise TinyError(message=msg, title=title or _("Error"))
TinyError: 'utf8' codec can't decode byte 0xbc in position 10: unexpected code byte

The exception is generated when calling:

class XMLRPCGateway(RPCGateway) in rpc.py

return getattr(sock, method)(*args)

I suspect the return xml by xmlrpclib is corrupted.

Is there anyway that I can modify openerp-server to return xml in binary representation? (Since it is a pdf report)

Thanks.