Hi Samba,
Steps to follow to resolve the issue.
1. logon to the configtool.
2. select the file->cleck on safe mode.
3. For instance select no for each instance. This will bring the java stack from safe mode to normal mode.
4. then restart the system and when the system will come up completely then resume the SU M tool.
The error is related to deployer controller which has stopped.
More over check the deploy.trc and std_server0.out file in /usr/sap/<SID>/<instance JC or J<XX>>/work directory which will give you the exact error. I face several time the same issue this is how i resolved.
Hope it will be helpful to you.
With Regards
Ashutosh Chaturvedi