sqlite3-ruby | Ruby bindings for the SQLite3 embedded database | Database library

I'm trying to set up a SQLite Db for my sinatra app and am running into an error I can't figure out. I've looked up related questions but none of them have helped.

Up to this point I've run bundle exec rake db:create_migration NAME=create_budget which created a migration in my db folder.

However when I run bundle exec rake db:migrate I get the following error message:

ActiveRecord::ConnectionNotEstablished: No connection pool with 'primary' found.

I am following the tutorial https://learn.co/lessons/sinatra-activerecord-setup

database.yml - the instructions did not say to create this but in researching the error this seemed to keep coming up. This is still magic to me as a learn so I'm not sure if activerecord requires this or not.

I'm new in linux, and i know that this should be a stupid question, but i didn't find anything over the internet, so i decide to ask it here:

During the configuration of the COTson program using this line of code it gives me an error:

CODE: ./configure --simnow_dir ../simnow-linux64-4.6.2pub

ERROR :

I have a very large amount of migration files that need to run and some of them apparently are outdated. For example:

This fails:

When loading the schema in my Rails 5.1 application on heroku, the following exception gets raised:

ActiveRecord::StatementInvalid: PG::SyntaxError: ERROR: syntax error at or near "ENGINE" LINE 1: ...estamp NOT NULL, "updated_at" timestamp NOT NULL) ENGINE=Inn...

Details:

Trace