Songs that exist in iTunes cannot be played with Spotify

[Terrorgiraffe]

Hi everybody,

I transfered my iTunes library to an external harddrive which is usually not connected to my MacBook. When I try to play a song from Spotify that also exists on my external iTunes library it seems that Spotify tries to connect to this library and doesn't play the song. It only works for titles that don't show the icon for local files. I'm not sure it's only a bug or what I have to do in the settings that Spotify does not play the titles from my songs listed in iTunes.

Maybe somebody can help me. Thanks!