OpenERP Client Error

 SyntaxError: JSON.parse: unexpected end of data
 http/mydomain:8069/web/webclient/js:23114

Solutions:

openerp version 6.1, the python library for pdf is 0.8.3 (werkzeug), the higher or earlier are problems. This is the link with the help that has worked pip install werkzeug==0.8.3 or easy_install werkzeug==0.8.3