The kraken integration has been installed bwithout errors
2021-08-07 09:21:11 INFO (MainThread) [homeassistant.setup] Setting up kraken
2021-08-07 09:21:11 INFO (MainThread) [homeassistant.setup] Setup of domain kraken took 0.0 seconds
2021-08-07 09:22:14 INFO (MainThread) [homeassistant.components.sensor] Setting up sensor.kraken
I found the same issue. After every new HA version or every HA restart the Kraken is corrupt. Remove and re-install of integration works as workaround but is not the solution.