core: can't add new roomba

The problem

can’t add new roomba integration to existing HA installation

after adding integration in configuration>integrations i’ve get the error “Config Flow could not be loaded”

What is version of Home Assistant Core has the issue?

core-2021.5.4

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant OS

Integration causing the issue

roomba

Link to integration documentation on our website

https://www.home-assistant.io/integrations/roomba/

Example YAML snippet

n/a

Anything in the logs that might be useful for us?

nothing

Additional information

No response