Fatal error: ... checkToken() in controller.php on line 52

[elopoppi]

Hello,

I'm upgrading/migrating my website.
-Have upgrated from the old 1.5.15 to 1.5.26
- have installed Jupgrade
- have upgrated using jupgrade to 2.5

and was able to login w/o problem to back end

then Jupgrade asked to upgrade to 2.5.4
which I did

Only then was I taken through the 6 or so steps of installation
(creation of website w/ joomla, msql login etc)

When finished, successfully deleted "Installation" files

Now:
I can no longer login to back-end and get this message:

Fatal error: Call to undefined method JSession::checkToken() in /homez.46/roulevog/www/jupgrade/administrator/components/com_login/controller.php on line 52

I have tried, as seen on other topics, copying original controller.php file... doesn't change anything.
and I have no idea either of what the error means or how to fix it... obviously otherwise I wouldn't be posting...

Thanks in advance for any help

[toivo]

The error message means that a certain file containing the definition of the checkToken method or function in the class JSession is missing. That file is libraries/joomla/session/session.php. You can find the file from the installation archive and copy it to the server.

If more files are missing, it is best to copy all the installation files - except the installation folder - to the server.

[elopoppi]

Thank you!
this has easily solved my access problem to the back end. I now can see that...

- the Joomla version actually installed is 2.5.1... ? OK, I can re-upgrade to 5.2.4
BUT
all my content has disappeared...

I can copy/paste content from "old" site to this one, but is there any other way I can "recuperate" my content ?
If not, then I'll go the long way home

Thanks again for your help!

[humvee]

How far did you follow toivo's advice?
Did you just upload that one file or copy the whole joomla_package?
You did not run the installation again, did you?
Is all your content still present in the database? Check with PHPMyAdmin or similar.

[elopoppi]

Hello,

I only re-uploaded the one file: session.php and did not re-run installation.

The website appeared fine, but all the content is invisible.
I say invisible because through PHPMyAdmin I was able to see that the content is all there...

However, since yesterday I have a new problem - but this one with my host who is not replying.
My website redirects to the webmail interface - without me asking anything...
So I guess until my host get this solved I won't be able to do much on the website - not through joomla! interface at least.
Through PHPmyAdmin yes though...