Database Error (Sqlite) in unity 4.0

Assets/Scripts/Database.js(12,21): BCE0018: The name ‘IDbConnection’ does not denote a valid type (‘not found’). Did you mean ‘System.Runtime.InteropServices.ComTypes.ITypeComp’?

Assets/Scripts/Database.js(13,21): BCE0018: The name ‘IDbCommand’ does not denote a valid type (‘not found’). Did you mean ‘System.Runtime.InteropServices.ComTypes.ITypeComp’?

Assets/Scripts/Database.js(14,22): BCE0018: The name ‘IDataReader’ does not denote a valid type (‘not found’).

Put Mono.Data.Sqlite.dll , Mono.Data.SqliteClient.dll , sqlite3.dll and System.Data.dll into Plugins folder.

Dont put Database in Editor Folder. Put it anywhere else