Search Box gives "ProgrammingError": column askbot_thread.text_search_vector does not exist

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please help... i get the following error when i try to deploy askbot

ProgrammingError at /questions/scope:all/sort:activity-desc/page:1/query:financial/ column askbot_thread.text_search_vector does not exist LINE 1: SELECT COUNT() FROM (SELECT DISTINCT (ts_rank(askbot_thread... ^ Request Method: GET Request URL: [] Django Version: 1.8.12 Exception Type: ProgrammingError Exception Value:
column askbot_thread.text_search_vector does not exist LINE 1: SELECT COUNT() FROM (SELECT DISTINCT (ts_rank(askbot_thread... ^ Exception Location: /app/.heroku/python/lib/python2.7/site-packages/django/db/backends/utils.py in execute, line 64 Python Executable: /app/.heroku/python/bin/python Python Version: 2.7.11 Python Path:
['/app', '/app/.heroku/python/lib/python2.7/site-packages/setuptools-20.4-py2.7.egg', '/app/.heroku/python/lib/python2.7/site-packages/pip-8.1.1-py2.7.egg', '/app', '/app/.heroku/python/lib/python27.zip', '/app/.heroku/python/lib/python2.7', '/app/.heroku/python/lib/python2.7/plat-linux2', '/app/.heroku/python/lib/python2.7/lib-tk', '/app/.heroku/python/lib/python2.7/lib-old', '/app/.heroku/python/lib/python2.7/lib-dynload', '/app/.heroku/python/lib/python2.7/site-packages', '/', '/app/.heroku/python/lib/python2.7/site-packages/askbot/deps'] Server time: Tue, 12 Apr 2016 00:50:14 +0800