Error before updating scaffolding from new db schema try creating

When a Civi CRM site is upgraded to a new version, there are frequently changes to the structure of the database.

To help illustrate how to use the above features, we’ll walkthrough building a simple data-drive site. NET MVC 3 project (using the File-New Project menu command).

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This approach is to be ignored, if the existing database is very large.

Now when I run the ruby script/generate scaffold Aircrew Admin I get the following message:error Before updating scaffolding from new DB schema, try creating a table for your model (Aircrew)The database and the plural name of the table exists but I cannot run the scaffold command.