ERROR: Multiple .bb files are due to be built which each provide connman-1.21-r20.0 (/home/tassle/src/oe/sources/meta-proxdynamics/recipes-connectivity/connman/connman_1.21.bb /home/tassle/src/oe/sources/openembedded-core/meta/recipes-connectivity/connman/connman_1.21.bb).
 This usually means one provides something the other doesn't and should.