Sure

For debugging purposes I started the calibre server in foreground. Normally it is started by system during boot.
Code:
root@server:/opt# LIBRARY_PATH='/srv/calibre-library' && PORT='4711' && /usr/bin/calibre-server --auto-reload --port $PORT $LIBRARY_PATH
Auto-restarting server on changes press Ctrl-C to quit
Watching 1 directory trees for changes
Traceback (most recent call last):
File "site.py", line 77, in main
File "site-packages/calibre/srv/standalone.py", line 199, in main
File "site-packages/calibre/srv/auto_reload.py", line 407, in auto_reload
File "site-packages/calibre/srv/auto_reload.py", line 266, in __enter__
File "site-packages/calibre/srv/auto_reload.py", line 300, in restart
File "site-packages/calibre/utils/rapydscript.py", line 206, in compile_srv
IOError: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/opt/calibre/lib/python2.7/imgsrc/srv/generate.py'