Error report after service restart

[chriswsq]

{"Version":"20.12.2","caller":"node.go:560","level":"info","module":"oasis-node","msg":"Starting oasis-node","ts":"2021-05-10T02:53:44.420111467Z"}
{"caller":"node.go:576","err":"failed to open persistence database: Cannot acquire directory lock on "/data/persistent-store.badger.db". Another process is using this Badger database.: resource temporarily unavailable","level":"error","module":"oasis-node","msg":"failed to open common node store","ts":"2021-05-10T02:53:44.426644523Z"}

What is the problem, please? How to solve