Fix or document "Failed to retrieve dataStateAt" error at start of dblab_server
It you start new DLE using tutorial you will get next error.
[ERROR] Failed to retrieve dataStateAt from DBMarker config: open /var/lib/dblab/dblab_pool/data/.dblab/dbmarker: no such file or directory
It's unclear what to do with error message.
Goal
Fix the error or document it.