Couldn't load plugin tplUserStatsReport due to an error when calling its initGui() method

TypeError: Expected bytes or unicode string, got newstr instead
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/qgis/utils.py", line 342, in startPlugin
    plugins[packageName].initGui()
  File "/home/hasan/.qgis2/python/plugins/tplUserStatsReport/tplUserStatsReport.py", line 203, in initGui
    self.setInitialStats();
  File "/home/hasan/.qgis2/python/plugins/tplUserStatsReport/tplUserStatsReport.py", line 330, in setInitialStats
    connect= psycopg2.connect("dbname='"+str(Configuration.dbname)+"' user='"+str(Configuration.username)+"' host='"+str(Configuration.host_ip)+"' port="+str(Configuration.port)+" password='"+str(Configuration.password)+"'")
  File "/usr/local/lib/python2.7/dist-packages/psycopg2/__init__.py", line 129, in connect
    dsn = _ext.make_dsn(dsn, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/psycopg2/extensions.py", line 155, in make_dsn
    parse_dsn(dsn)
TypeError: Expected bytes or unicode string, got newstr instead


Python version: 2.7.12 (default, Nov 19 2016, 06:48:10) [GCC 5.4.0 20160609]
QGIS version: 2.18.2 Las Palmas, 102ee87

Python Path:
/usr/share/qgis/python/plugins/processing
/usr/share/qgis/python
/home/hasan/.qgis2/python
/home/hasan/.qgis2/python/plugins
/usr/share/qgis/python/plugins
/usr/lib/python2.7
/usr/lib/python2.7/plat-x86_64-linux-gnu
/usr/lib/python2.7/lib-tk
/usr/lib/python2.7/lib-old
/usr/lib/python2.7/lib-dynload
/home/hasan/.local/lib/python2.7/site-packages
/usr/local/lib/python2.7/dist-packages
/usr/local/lib/python2.7/dist-packages/TileStache-1.50.1-py2.7.egg
/usr/lib/python2.7/dist-packages
/usr/lib/python2.7/dist-packages/PILcompat
/usr/lib/python2.7/dist-packages/gtk-2.0
/home/hasan/.qgis2//python