Unable to load the requested class: sessionmessage

An Error Was Encountered
Unable to load the requested class: sessionmessage - (Message as it appears in browser)

Did some searching on the old forum and the new forum (here)

http://stackoverflow.com/questions/12996...-class-enc
- The encrypt file is intact
- not sure of the following quote, which file is it referring to

Presumably, the error is a result of one of the following reasons.
1) Somehow the filename of the library managed to chance causing CodeIgniter to be unable to find the file
2) Perhaps the file doesn't exist on the server and once again, CodeIgniter is unable to find it.
3) The filename may be different to that you are referring to in your code.

I am in process of moving website to a new host. The old host is windows based, the new is not. Domain not reassigned yet.
I changed the database file, that connects ok now
config.php has base_url changed to new address using IP/mysite
config.php has base_path changed to reflect new server
autoload.php is there and appears to need no changes

With moving to a linux based server maybe there is something else.

Any help appreciated.

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