EF 4.1 Code First error - The entity type SomeType is not part of the model for the current context

Question

While working with EF code first I get error given below at different times:

The entity type SomeType is not part of the model for the current context.

What are the possible causes of this error?

Answer 1

It may occur because:

• DbContext configured with an incorrect connection string
• The entity specified is actually not mapped in configuration