vSphere HA State Initialization Error 5.0

Hi all,

After upgrading my vCenter server to 5.0 U3e, now the 3 hosts we have shows the message "vSphere HA agent for this host has an error: vSphere HA agent cannot be correctly installed or configured", and in vSphere HA State it shows "Initialization Error"

The ESXi are runing build 2509828 and the vCenter server build is 3073236.

I've tried the option "Reconfigure for vSphere HA" several times, but it keeps failing.

Any idea what can I do?

Thanks!