staring WMS. JVM error?

I am getting the following error when i tried to strart WMS.

Error occurred during initialization of VM
Could not reserve enough space for object heap
Could not create the Java virtual machine

It was working fine previously. I tried to solve the issue by changing the memory size in server.property but no luck yet.
Hava you ever encountered such problem before?

thanks for ur help

Hi Kerni,

This is a tough one to troubleshoot, so I would suggest that you contact our Support Organization to get this resolved.

Sorry that I can’t be of more help here.

Regards,
Thomas

Is operating system Windows? If so try to restart your server. This error may happen on Windows when memory get too fragmented and VM needs to allocate a continues block up to its -Xmx value