BUG #13505: Create Extension

The following bug has been logged on the website:

Bug reference:      13505
Logged by:          priyanka konduru
Email address:      priyanka@rirl.org
PostgreSQL version: 9.4.0
Operating system:   windows
Description:

Hi I am trying to  activate tablefunc extension by using create extension
But nable to i am getting error saying

ERROR:  syntax error at or near "EXTENSION"
LINE 1: CREATE EXTENSION adminpack;
               ^

********** Error **********

ERROR: syntax error at or near "EXTENSION"
SQL state: 42601
Character: 8

Please help in overcoming this youe support will be much appreciated.