Comment 43 for bug 551269

From the Debian bug report
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=578981

"Would you please try to remove your /etc/phpldapadmin/config.php and run
dpkg-reconfigure phpldapadmin, or otherwise manually upgrade your config
file?

I'm sorry, but no automatic upgrade can be performed for the configuration
file, which changed between the releases; the best I can do is to document
such a change in README.Debian and/or NEWS.Debian.

Best regards,
Fabio"

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For those still experiences issues, can you try the above suggestion.