Django xhtml2pdf error

I am trying to generate a pdf from xhtml2pdf using the django-xhtml2pdf helper, but I am getting the xhtml2pdf library error. Could you help me?

This is mistake. thank

SyntaxError at /

invalid syntax (util.py, line 302)

Request Method:     GET
Request URL:    http://localhost:8000/
Django Version:     1.7.7
Exception Type:     SyntaxError
Exception Value:    

invalid syntax (util.py, line 302)

Exception Location:     /usr/lib/python3.4/site-packages/xhtml2pdf/__init__.py in <module>, line 41
Python Executable:  /usr/bin/python
Python Version:     3.4.3
Python Path:    

['/home/ed/syscat',
 '/usr/lib/python34.zip',
 '/usr/lib/python3.4',
 '/usr/lib/python3.4/plat-linux',
 '/usr/lib/python3.4/lib-dynload',
 '/usr/lib/python3.4/site-packages']