Hi Jean_Claude, This is a missing parameter issue. Without knowing the details of that version, the fix-all solution is to delete the config file and let the program re-create it. Under Linux in .pskmail, under Windows in Documents and settings\YourUserName\pskmail 73, John On 31/10/2011 7:31 AM, "jcjglt@xxxxxxxxx" <jcjglt@xxxxxxxxx> wrote: I tried to start jPSKMail with the new jPSKMail_mod.jar and got the following message : < Problem Message : For input string:"" From class: class java.lang.**NumberFormatException Problems with config parameter. > I am currently working 1.4.b7 on a Windows XP and Ubuntu 10.04LTS without problems. Do I need to change any java settings or load another java to test jPSKMail_mod.jar ?