Run-directory (null) is missing starting sap

Hi

I am trying to start the sap system but i am getting this error:

Run-directory (null) is missing

Please create it and start again

Opening Database...

/usr/sap/MX1/SYS/exe/run/startdb: line 165: x_diagnose: command not found

I am suspecting that it could be SIDADM env:

PATH=/usr/java/j2sdk1.4.2_14/bin:/sapdb/programs/bin:.:/home/mt1adm:/usr/sap/MX1/SYS/runU:/usr/sap/MX1/SYS/exe/run:/opt/kde3/bin:/opt/gnome/bin:/usr/games:/home/mt1adm/bin:/usr/bin/X11:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/usr/lib/ja

How can one edit and remove the semicolon and full stop (:.) between bin and /home. did anyone faced a problem like this b4.

Your help apreciated