Ruby on Rails

Check to see if you have duplicate code in any of your migrations to
create this table:

> SQLite3::SQLException: table "sessions" already exists: CREATE TABLE
> "sessions" ("id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, "session_id"
> varchar(255) NOT NULL, "data" text, "created_at" datetime, "updated_at"
> datetime)

This can easily happen if you have code to create all your tables in
the main CreateDatabase migration file, then run script/generate to
generate scaffolding or a model for an existing table. The generator
script will create a new migration with table creation code, causing
rake to choke the next time you do a migration.

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