Could be cache related problem; you could try to remove the applicatiom cache folder /home/user/MyDocs/.qspot.
/opt/qspot/bin $ ./qspot > set_stream 'QSpot' MESSAGE (log): "11:24:06.368 I [offline_authorizer.cpp:279] Unable to login offline: no such user" MESSAGE (log): "11:24:06.387 I [ap:1751] Connecting to AP ap.spotify.com:4070" MESSAGE (log): "11:24:06.670 I [ap:1209] Connected to AP: 78.31.8.51:4070"