Textacular Fuzzy Search - ruby-on-rails

Question

I was trying to implement the textacular gem in my Rails 4 App. Basic and Advanced Search work fine, but when I try to implement Fuzzy Search, I encounter some trouble.
Installation Instructions from the Repository:
Finally, the #fuzzy_search method lets you use Postgres's trigram
search funcionality.
In order to use this, you'll need to make sure your database has the
pg_trgm module installed. On your development machine, you can require
textacular/tasks and run
rake textacular:install_trigram
Depending on your production environment, you might be able to use the
rake task, or you might have to manually run a command. For Postgres
9.1 and above, you'll want to run
CREATE EXTENSION pg_trgm;
What I've Tried
I tried running rake textacular:install_trigram and bundle exec rake textacular:install_trigram in the root directory of my app and I get this message:
/usr/local/Cellar/postgresql/9.2.4/share/postgresql/extension/pg_trgm.control
rake aborted!
PG::InsufficientPrivilege: ERROR: permission denied to create extension "pg_trgm"
HINT: Must be superuser to create this extension.
: CREATE EXTENSION pg_trgm;
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/postgresql/database_statements.rb:128:in `exec'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/postgresql/database_statements.rb:128:in `block in execute'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract_adapter.rb:425:in `block in log'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.0/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract_adapter.rb:420:in `log'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/postgresql/database_statements.rb:127:in `execute'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/textacular-3.1.0/lib/textacular/postgres_module_installer.rb:54:in `install_postgres_91_module'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/textacular-3.1.0/lib/textacular/postgres_module_installer.rb:7:in `install_module'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/textacular-3.1.0/lib/textacular/tasks.rb:14:in `block (2 levels) in <top (required)>'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/bin/ruby_noexec_wrapper:14:in `eval'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/bin/ruby_noexec_wrapper:14:in `<main>'
Tasks: TOP => textacular:install_trigram
Based on this, I tried sudo rake textacular:install_trigram and I got this:
cannot load such file -- bundler/setup
/Users/ssapra/Sameet/Programming/WebDev/Rails/myapp/config/boot.rb:4:in `<top (required)>'
/Users/ssapra/Sameet/Programming/WebDev/Rails/myapp/config/application.rb:1:in `<top (required)>'
/Users/ssapra/Sameet/Programming/WebDev/Rails/myapp/Rakefile:4:in `<top (required)>'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/bin/ruby_noexec_wrapper:14:in `eval'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/bin/ruby_noexec_wrapper:14:in `<main>'
(See full trace by running task with --trace)
Lastly, after reading the For Postgres 9.1 and above, I tried running psql and then CREATE EXTENSION pg_trgm;. No errors (although anytime I do it now, it will tell me it already exists). So I \quit and then replace my line of code that does work:
#search = Content.advanced_search(params[:search].split(" ").join("|")).basic_search(params[:search])
with:
#search = Content.fuzzy_search(title: params[:search]).fuzzy_search(text: params[:search])
or even:
#search = Content.fuzzy_search(params[:search])
and I get this:
PG::UndefinedFunction: ERROR: operator does not exist: character varying % unknown
LINE 1: ...NT(*) FROM "contents" WHERE (("contents"."title" % 'inv')) ...
^
HINT: No operator matches the given name and argument type(s). You might need to add explicit type casts.
: SELECT COUNT(*) FROM "contents" WHERE (("contents"."title" % 'inv')) AND (("contents"."text" % 'inv'))
It gets stuck on the first line:
-if #contents.empty?
%p="No results found for: #{#query}"
-elsif !#query.empty?
%p="Your search results for: #{#query}"
Contents Controller
In my contents_controller.rb:
I have these three additions:
require 'textacular'
require 'textacular/tasks'
ActiveRecord::Base.extend(Textacular)
I am running Postgres 9.2.4. Any ideas?