Start OpManager as a service on WIndows

Start OpManager as a service on WIndows

I'm trying to start opmanager as a service on Windows 2008.
I've ran the script .\bin\OpManagerService.bat -i to install the windows service. It creates a  windows services, which is good I guess, but when I try to start the service I get an error in the logfile .\logs\wrapper.log. Here's what's in the log.

STATUS | wrapper  | 2016/08/10 09:37:31 | --> Wrapper Started as Service
STATUS | wrapper  | 2016/08/10 09:37:31 | Java Service Wrapper Professional Edition 64-bit 3.5.15
STATUS | wrapper  | 2016/08/10 09:37:31 |   Copyright (C) 1999-2012 Tanuki Software, Ltd. All Rights Reserved.
STATUS | wrapper  | 2016/08/10 09:37:31 |     http://wrapper.tanukisoftware.com
STATUS | wrapper  | 2016/08/10 09:37:31 |   Licensed to Zoho Corporation Pvt. Ltd. for ManageEngine OpManager
STATUS | wrapper  | 2016/08/10 09:37:31 |
STATUS | wrapper  | 2016/08/10 09:37:32 | Launching a JVM...
INFO   | jvm 1    | 2016/08/10 09:37:33 | WrapperManager: Initializing...
INFO   | jvm 1    | 2016/08/10 09:37:35 | java.lang.NullPointerException
INFO   | jvm 1    | 2016/08/10 09:37:35 |     at com.adventnet.launcher.nms.StartNmsJdbc.run(StartNmsJdbc.java:187)
INFO   | jvm 1    | 2016/08/10 09:37:35 |     at java.lang.Thread.run(Unknown Source)
STATUS | wrapper  | 2016/08/10 09:38:37 | <-- Wrapper Stopped

I don't know what's going on and why OpManager won't start as a service.
Can anybody help me with running OpManager as a service in windows 2008?

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