Welcome to DevKinsta @Rob_Clark ! I’m happy to help. 
DK0029 error can be a wide variety of issues that is blocking DevKinsta. There’s a thread here with a few solutions but I’ll highlight here a few possible solutions.
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Try running the following command on Terminal:
docker exec -it devkinsta_fpm /bin/rm /root/.ssh/known_hosts -
Disable any anti-virus software or firewalls in place on the machine.
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Ensure you’re using DevKinsta 2.1.0+
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Run DevKinsta as an Administrator
Let me know if that helps!