Frequently asked questions and Answers

installer does not work on windows vista

the work around is to install on another computer and copy the install folder to the vista machine.

If NEPOMUK crashes - will I lose my data?

No, every time you restart NEPOMUK it will make a backup into a zipped text-file in your home folder. The backup is in the folder ~./nepomukdata/backup and the backups of the last days are kept. The contents of the file is stored as "trig" (this is a W3C standard file format, which is very safe and can be read by different tools).

To restore such a backup, unzip the backup file and go to this page on your local nepomuk.

Can I reinstall NEPOMUK?

Yes,

• get a newer version from NightlyBuilds.
• Delete the folder (your programs)/NEPOMUK/plugins/* - the installer will add to this folder but not delete the existing plugins.
• Install it again, it should use your existing data.
• In the installer dialog asking for email and name, enter the values you entered before, which you find in ~/.nepomuk/config/userconfig.properties.
• Tell NEPOMUK to look for the new plugins using the clean parameter on the next start: nepomuk -clean

Problems using NEPOMUK and possible fixes

403 restricted when accessing web frontent

When opening http://localhost:8181/server/index.html, you get a HTTP-Error 403. This can be connected to a configuration error in NEPOMUK's desktop web server.

Try

• http://127.0.0.1:8181/server/index.html

RdfRepository database corrupted

The internal database of NEPOMUK (RdfRepository) may get corrupted by concurrent modiffications, i.e. when multiple things are done in parallel by background services a user can't influence. The problem shows in various error messages in the users interface ("search error") and is known and may be addressed in the future.

See more in known known problems section of RdfRepository.

On MacOsx NEPOMUK causes syslogd to user 100% cpu

And you will need to restart the machine after a short while.

To fix this you must let nepomuk log to the console instead. Do this by running NEPOMUK/nepomuk.app/Contents/MacOS/nepomuk from the commandline:

NEPOMUK/nepomuk.app/Contents/MacOS/nepomuk 

We are trying to find a better fix :( watch #580 for updates.

It takes up too much memory (1gb)

Edit the file NEPOMUK/configuration/config.ini and remove some of these lines to disable all optional services. One of them may cause a problem, we don't know yet (29.8.2008) which.

    org.semanticdesktop.nepomuk.comp.taskservice@18:start,\
    org.semanticdesktop.nepomuk.comp.strucrec@17:start,\
    org.semanticdesktop.nepomuk.comp.kaukoluwikiclient@17:start,\
    org.semanticdesktop.nepomuk.comp.social@19:start,\
    org.semanticdesktop.nepomuk.comp.communitymanager@20:start,\
    org.semanticdesktop.nepomuk.comp.tagrecommender@20:start,\
    org.semanticdesktop.nepomuk.comp.metadatarecommender@20:start,\

It takes too much processor resource ( ~100%)

On 02.09.2008 crawling data sources causes this, deactivate Aperture DataWrapper should solves the problem temporary.

Then call this (in a shell) to refresh the configuration (clean does NOT delete your data, it deletes cached configurations of the plugin manager we use, OSGi)

% /Applications/nepomuk.app/Contents/MacOS/nepomuk -clean

Geo Location sometimes crashes

On 05.09.2008 sometimes Geo Location crashes and throw exception. Problem was defined at the moment only for IE. This is know problem and has attached ticket:577. One of the possible solution is to delete IE cache.