An error occured :(

Error code : err:FODC0007
Error stack trace : Stopped at /srv/basex/webapp/synopsx/models/synopsx.xqm, 227/17: [FODC0007] Invalid database name: ''. Stack Trace: - /srv/basex/webapp/synopsx/models/tei.xqm, 115/48 - /srv/basex/webapp/synopsx/models/synopsx.xqm, 169/36 - /srv/basex/webapp/synopsx/models/synopsx.xqm, 169/51