Nov 08 17:23 : player: played "USB/Seagate_Portable_Drive/Various Composers; Jordi Savall, Hespèrion XX - Elizabethan Consort Music 1558-1603/29. Hesperion XX – In Nomine V a 7.flac"
Nov 08 17:23 : exception: Bad song index
Nov 08 17:24 : exception: No such directory
Nov 08 17:24 : exception: No such directory
Nov 08 17:24 : exception: No such directory
Nov 08 17:24 : exception: No such directory
Nov 08 17:36 : player: played "USB/Seagate_Portable_Drive/Bowen, York; Andrew Davis, BBC SO - Symphonies Nos 1 & 2 [24-96]/01 Symphony No. 1, Op. 4/01 - Edwin York Bowen Symphony No. 1, Op. 4 - I. Allegro assai.flac"
Above suggests that the mpd database holds references to removed by an external actions objects or referenced objects are in incorrect type. As a first action I would re-scan the Music Sources to see if such inconsistency can be reduced.