java.lang.NumberFormatException: For input string: "null" Error: Web Server Session Expired.
 
 
HelpInfo
Error: Web Server Session Expired.
Message

Your session with the Web server expired. You have been logged out.
Cause of Error

Client machine idle for 20 minutes or more.
Solution Summary

Click 'Tools' and select 'Internet Options'. Click 'Delete Files' to delete the temporary Internet files. Click the 'Settings' button. Select the 'Automatically' option and click 'OK'. Login again.
Solution Details

1) In the Web Browser, click 'Tools' and select 'Internet Options'. (The 'Internet Options' dialog box appears.)
2) Click 'Delete Files' to delete the temporary Internet files.
3) Click the 'Settings' button. (The 'Settings' dialog box appears.)
  'Settings' dialog box
4) Select the 'Automatically' option and click 'OK'.
5) Click 'OK'.
6) Login again.
  NOTE: If the problem still persists, contact your Citrix system administrator.
Applies to Software Version

Citrix MetaFrame for Windows XP