getting this error at server start. only symptoms identified so far is /list shows all players as default rank (but the error occurs when loading several plugins)

[05:20:36] [Server thread/WARN]: [Essentials] Detected supported permissions plugin PermissionsBukkit without Vault installed.
[05:20:36] [Server thread/WARN]: [Essentials] Features such as chat prefixes/suffixes and group-related functionality will not work until you install Vault.
[05:20:36] [Server thread/INFO]: [Essentials] Using superperms-based permissions.

Versions:
Essentialsx - v2.0.1-b237
Permissionsbukkit - v2.4
Vault - v1.5.6-b49

Can you pastebin startup log entries mentioning Vault

http://pastebin.com/NjWJD9AD

full startup log, it gets a fair few mentions (71..)

Closing due to inactivity. If this is still a problem, please open a new issue.