Error in listing modules

If you get an error listing all the available modules in the modules 
module, (iirc its a Bad paramater error) then it is most likely due to 
either duplicate entries in the xar_modules or xar_modules_states tables.
It can also be caused by a discrepancy between the contents of those 
tables and the information in the filesystem.

For instance I saw a problem recently where an old 0.9.0.5 site was 
updated to 0.9.7, the upgrade went cleanly but it wasnt possible to list 
all available modules.

This turned out to be due to the davedap module being renamed to 
phpldapadmin. Once the davedap directory (from 0.9.0.5) was deleted 
(there was a newer one from 0.9.7 called phpldapadmin) and the davedap 
entries in the xar_modules and xar_modules_states tables deleted 
everything worked perfectly.

So something to check if you get problems with the modules module.

Also a good reason not to rename modules ;-)

miko