Distributed Power Managment tried to bring a host out from standby mode, but the host failed to exit standby mode.
Standby Mode powers off a vSphere host and allows it to be powered back on again through Wake-on-LAN protocol triggered either manually or automatically by VirtualCenter.
There may be some issue with Wake-on-LAN (or the specific technology applicable to the hardware of this host). Check the host network and hardware status.
Power the host on using a different method and then disable VMware DPM on that host until you the issue is resolved.
See the vSphere Resource Management Guide for more information.
Refer to the VMware Online Documentation for more information on vCenter event messages and possible solutions.