c# - SSIS Script Vague Error "Object Refrence not set to an instance of an object" -

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i'm working on ssis script, , going through visual studio, when execute get:

[ftp script task] error: error: object reference not set instance of object.

here's code running. doing wrong?

    public void main()     {         try                     {                             // ftp connection connection managers collection                             connectionmanager ftpserver = dts.connections["sftp_connection"];                               // create ftp connection object , credentials of connection manager                             ftpclientconnection sftp_connection = new ftpclientconnection(ftpserver.acquireconnection(null));              // open connection                             sftp_connection.connect();                               // set work folder value of variable                             sftp_connection.setworkingdirectory(dts.variables["ftpworkingdirectory"].value.tostring());              // create stringarrays filenames , folders                             // foldernames aren't used, mandatory                             // next method.                             string[] filenames;                             string[] foldernames;                               // directory listing , fill stringarray variables                             sftp_connection.getlisting(out foldernames, out filenames);              sftp_connection.receivefiles(filenames, "\\\\server\\e$\\informatica_incoming\\versadex\\cad\\work\\test\\", false, false);                               // close connection                             sftp_connection.close();                               // close script task, set result success                             dts.taskresult = (int)scriptresults.success;                     }                      catch (exception ex)                     {                             // fire error , set result failure                             dts.events.fireerror(0, "ftp script task", "error: " + ex.message, string.empty, 0);             dts.taskresult = (int)scriptresults.failure;                     }     }


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