What does this error mean

[StevenCarlisle]

can someone explain wat this error means please

Fatal error: Unknown(): The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition <b>navigationhistory</b> of the object you are trying to operate on was loaded before the session was started in

[Shrike]

Do you have objects serialized in your sessions?

[StevenCarlisle]

yes i do, is that the problem?

[Shrike]

Possibly, when you unserialize the objects (by calling session_start()) PHP needs to have the class definition in memory. So include the file which has the class in before unserializing.

[StevenCarlisle]

thnaks man that worked like a charm