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Error when duplicate a module

Hello,

I have this error when I tempt to copy/duplicate a module.

See the video here:
https://www.dropbox.com/s/65go597ofpdofmd/Enregistrement%20de%20l%E2%80%99%C3%A9cran%202019-01-30%20%C3%A0%2011.14.20.mov?dl=0

Thanks
Alain