hummingbird: /run/hummingbird: getFileStatus: does not exist (No such file or directory)

[cdupont]

I try to run hummingbird for the first time:

$ sudo hummingbird broker
[2019-01-28 10:54:53 CET : hummingbird : INFO] Started hummingbird MQTT message broker.
[2019-01-28 10:54:53 CET : SimpleAuthenticator : INFO] Creating new SimpleAuthenticator.
[2019-01-28 10:54:53 CET : SimpleAuthenticator : INFO] Looking for principal definitions in "/etc/hummingbird/principals".
[2019-01-28 10:54:53 CET : SimpleAuthenticator : DEBUG] Inspecting path "/etc/hummingbird/principals".
[2019-01-28 10:54:53 CET : SimpleAuthenticator : DEBUG] Inspecting path "/etc/hummingbird/principals/mqtt-default.yml".
[2019-01-28 10:54:53 CET : SimpleAuthenticator : DEBUG] Loaded SimplePrincipalConfig {cfgUUID = e4f7f759-a7f0-4ae7-8140-766269e1c503, cfgUsername = Just (Username "mqtt-default"), cfgPasswordHash = Just "$2y$14$z1TeFmnk9zirP1Ml55lVyuOWOhaYyqlHlvd6meaze2KDYPH8hrdsS", cfgQuota = Nothing, cfgPermissions = fromList [("#",Identity [Publish,Subscribe,Retain])], cfgPubKeys = [PubKeyRSA (PublicKey {public_size = 256, public_n = 22308942959693450164805414784622039119953869676598494040490474876845113011423244363133504464639934332123824098648383695629950150740661240301797557789182881627518325410401761214390870746782142890256330810683259925120714609191450018846802295942368288474822201833573214569087558505560609454735289847189481477441119371414955982136284383371075357537016744791612856244809403031774668623777419463250379304610626415753799894380826997107551511307557394469393256023125370558067711177534861949701053775350975064219762470558885671887833718238237288150961742044857994737398622408909061802106648686005822374306713833889769779813399, public_e = 65537})]}
[2019-01-28 10:54:53 CET : SimpleAuthenticator : INFO] Found 1 principal definitions.
hummingbird: /run/hummingbird: getFileStatus: does not exist (No such file or directory)