In Icefish 9.0.0 I got following error while changing temperature

Mar 17 15:20:36 inf-agl-devstation afbd-hvac@0.1[1605]: qml: Left Temp changed 16
Mar 17 15:20:36 inf-agl-devstation afbd-agl-service-can-low-level@9.0[464]: ERROR: [API low-can] Error sending : 9 Bad file descriptor [/w/workspace/release-jjb-icefish-snapshot/MACHINE/intel-corei7-64/label/agl-test-slave/repoclone/output/tmp/work/corei7-64-agl-linux/agl-service-can-low-level/9.0.0-r0/git/low-can-binding/utils/socketcan-bcm.cpp:110,write_message]
Mar 17 15:20:36 inf-agl-devstation afbd-agl-service-can-low-level@9.0[464]: ERROR: [API low-can] Error write message id : 48 [/w/workspace/release-jjb-icefish-snapshot/MACHINE/intel-corei7-64/label/agl-test-slave/repoclone/output/tmp/work/corei7-64-agl-linux/agl-service-can-low-level/9.0.0-r0/git/low-can-binding/binding/low-can-subscription.cpp:755,tx_send]
Mar 17 15:20:36 inf-agl-devstation afbd-agl-service-can-low-level@9.0[464]: ERROR: [API low-can] Error sending : 9 Bad file descriptor [/w/workspace/release-jjb-icefish-snapshot/MACHINE/intel-corei7-64/label/agl-test-slave/repoclone/output/tmp/work/corei7-64-agl-linux/agl-service-can-low-level/9.0.0-r0/git/low-can-binding/utils/socketcan-bcm.cpp:110,write_message]
Mar 17 15:20:36 inf-agl-devstation afbd-agl-service-can-low-level@9.0[464]: ERROR: [API low-can] Error write message id : 48 [/w/workspace/release-jjb-icefish-snapshot/MACHINE/intel-corei7-64/label/agl-test-slave/repoclone/output/tmp/work/corei7-64-agl-linux/agl-service-can-low-level/9.0.0-r0/git/low-can-binding/binding/low-can-subscription.cpp:755,tx_send]

I added a slcan device as slcan0 and changed /etc/dev-mapping to hs="slcan0"  (was not sure if it is necessary but changed ls to "slcan0" too) and /etc/hvac.json "can_device": "slcan0"