SQLlite access problem throught mono

Hello, Im trying to access a SqlLite database through Mono.Data.SqliteClient. with free unity license.

“Mono.Data.SqliteClient.dll” and “System.Data.dll” or “sqlite3.dll” should be in the Assetes directory? The debug also gives me an error: “DllNotFoundException: sqlite3” when using “Mono.Data.SqliteClient.SqliteConnection.Open()”. Any suggestions will be appreciated. Thanks in advance.

import          System.Data; 
import          Mono.Data.SqliteClient;

private var dbConnection : IDbConnection;
   
   function OpenDB() {
	   dbConnection = new SqliteConnection("URI=file:database.db");
	   dbConnection .Open();
   }

what I’m trying to do is only possible in unity pro with pluggins?

works fine if i use the DLLs of unity framework installation directory. sorry