Issue regarding running rake db:seed task - ruby-on-rails

Question

I have an existing rails project and I am using postgres database and after successful execution of bundle exec rake db:migrate command when I am going to execute the bundle exec rake db:seed command then it throws me the following error.
rake aborted!
PG::DuplicateTable: ERROR: relation "schema_migrations" already exists
I have commented out the lines where the definition of the schema_migration table creation is stored such as in the development_structure.sql and test_structure.sql files. But it is still throwing me the error.
I don't know from where the schema_migration table is being created. There is no schema_migration.rb file in my project.
Pleas help me to fix this. Thanks in advance!
This is my error log.
rake aborted!
PG::DuplicateTable: ERROR: relation "schema_migrations" already exists
: CREATE TABLE "schema_migrations" ("version" character varying(255) NOT NULL)
/home/bit/.rvm/gems/ruby-2.1.5/gems/activerecord-2.3.18/lib/active_record/connection_adapters/abstract_adapter.rb:227:in `rescue in log'
/home/bit/.rvm/gems/ruby-2.1.5/gems/activerecord-2.3.18/lib/active_record/connection_adapters/abstract_adapter.rb:204:in `log'
/home/bit/Development/app2/application/lib/core_extensions/postgresql_adapter/reconnect.rb:26:in `execute'
/home/bit/.rvm/gems/ruby-2.1.5/gems/activerecord-2.3.18/lib/active_record/connection_adapters/abstract/schema_statements.rb:109:in `create_table'
/home/bit/.rvm/gems/ruby-2.1.5/gems/activerecord-2.3.18/lib/active_record/connection_adapters/abstract/schema_statements.rb:371:in `initialize_schema_migrations_table'
/home/bit/.rvm/gems/ruby-2.1.5/gems/activerecord-2.3.18/lib/active_record/migration.rb:441:in `initialize'
/home/bit/.rvm/gems/ruby-2.1.5/gems/rails-2.3.18/lib/tasks/databases.rake:193:in `new'
/home/bit/.rvm/gems/ruby-2.1.5/gems/rails-2.3.18/lib/tasks/databases.rake:193:in `block (2 levels) in <top (required)>'
/home/bit/.rvm/gems/ruby-2.1.5/bin/ruby_executable_hooks:15:in `eval'
/home/bit/.rvm/gems/ruby-2.1.5/bin/ruby_executable_hooks:15:in `<main>'
Tasks: TOP => db:seed => db:seed:common => db:seed:original => db:abort_if_pending_migrations
(See full trace by running task with --trace)

Answer 1

If it's OK to drop your data locally, try
rake db:drop db:create db:migrate
and then seed again. I've had similar issues in the past where I deleted a migration without properly rolling it back and this was the solution.
If you need to keep it, open the rails database (rails db from terminal) and try
drop table schema_migrations
(Run the migrations with db:migrate again after this)
Edit: This has not solved the issue yet, but it seems there may be other issues that need to be factored in. OP cannot launch rails console and receives
undefined local variable or method `vars' for #<Rails::Generator::Commands::Create:0x00000001ca2578>
as the error message each time - if anyone has ideas here, please add an answer!