yanni papastavrou <[EMAIL PROTECTED]> writes:

> “Using the default document class, because the class scrbook
> is unknown”


Hi, 

1. Open the MiKTeX Settings
2. Choose Package installation: Install missing packages on-the-fly: Yes
3. Then, reconfigure LyX

If this does not work, try 
1. Open MiKTeX > Settings
2. Choose Refresh FNDB
3. Then, reconfigure LyX

If this does not work, try 
1. Open MiKTeX > Update, and update MiKTeX
2. Open MiKTeX > Settings
2. Choose Refresh FNDB
3. Then, reconfigure LyX

Regards,
Andreas

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