Error: missing exoplatform environment class

Error number 4001 in 4: Error while parsing velocity page Wrapped
Exception: Invocation of method 'getDocument' in class
com.xpn.xwiki.api.XWiki threw exception class
java.lang.NoClassDefFoundError : org/exoplatform/commons/Environment

'A problem occured while trying to service your request. Please contact
the support if this happens again.

Detailed information:

Error number 0 in 11: Uncaught exception
Wrapped Exception: org/exoplatform/commons/Environment
com.xpn.xwiki.XWikiException: Error number 0 in 11: Uncaught exception
Wrapped Exception: org/exoplatform/commons/Environment
at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:134)'
...
java.lang.NoClassDefFoundError: org/exoplatform/commons/Environment
at
org.exoplatform.container.PortalContainer.getInstance(PortalContainer.java:73)'

• I am using Tortoisesvn update to get the latest
  so this is version 823 @ 20050913:15.xx