facing problem for connection to google cloud sql to google app engine

Dear


I am use the directive is " page
import="com.google.appengine.api.rdbms.AppEngineDriver" "

and driver is

Connection c = null;
c = DriverManager.getConnection("jdbc:google:rdbms://
codeguestbook:appshilendra/guestbook");

query

ResultSet rs = c.createStatement().executeQuery("SELECT * FROM
entries");

show the Error in error window

Could not change permissions on the launch config file

how can i do for solve this error