Impossible to create a group board and an Epic

Summary

  • I'm trying to create an Epic in a group and I get this error message: Error creating epic
  • I'm trying to create a group board and I get this error message: Unable to save your changes. Please try again

Version of GitLab: self-hosted 11.2.3-ee (aadca994)

Relevant logs and/or screenshots

Epic

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Board

image

image