Sonarr error - Preview

Unable to find image 'linuxserver/sonarr:preview' locally
preview: Pulling from linuxserver/sonarr
f8d91bef6144: Already exists
2ef8116b1a4d: Already exists
c7b3e88dd50e: Already exists
b4054006e35c: Already exists
731185ec0918: Already exists
bd354ee40a9b: Pull complete
5ba6f30e5546: Pull complete
Digest: sha256:cf556d12c96b2b4118a5084fe4a7380f397ca05b0a782e72c37c6bd90d1ee4b7
Status: Downloaded newer image for linuxserver/sonarr:preview
Error response from daemon: Invalid container name (sonarr:preview), only [a-zA-Z0-9][a-zA-Z0-9_.-] are allowed