I\'m running Rails 3.0.3 and I accidentally made a typo in my migration: I created a migration that creates a new column with a type of boolen (it should have b
You can also fix the database using a database tool. I had the same problem and used the great application "Base" for MacOS X. It allows you to change the field type of sqlite databases.
In the background it just creates a new table with the modified fields and copies the data from the original one. Worked for me!