Relationship Type in 2.31.4

I’ve been trying to create a Relationship Type in my instance (2.31.4) but all efforts have proved abortive.
When I try to create a Relationship Type I get an error. A look at the logs (attached screen shot) shows something to do with nulls. I can confirm that all fields on the Relationship creation page have all been filled.
My instance runs on Ubuntu 18.04.2 LTS.
Any urgent help will be appreciated.Relationship_Type

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