URGENT:: Server shuts down abruptly in WebNMS.

HI,
I am using WebNMS "Service Pack Version =AdventNet_Web_NMS-4.0-SP-2.0". I am observing this wierd behaviour in which the server suddenly shuts down giving error message as following.

##############################################################
Connection to the Database is lost. Server is being Shut Down
Please Restart the server
##############################################################

I am trying, to create ConfigTasks and deploying them on a list of around 300 devices. All the devices are fake so eventually the task should fail for each one of them. There is no error while creation of the task but as the task executes for around 20 odd devices, the server shuts down giving the above error message.

Can somebody please throw some light on this behaviour? I have configured few custom classes as Listeners for the ConfigTask. There is no exception in those classes. I am attaching log file with this one. Can see some exception corresponding to DeviceConfigurationApi but am not able to deduce anything out of it.

Thanks in Advance
Tushar