Nexus repository not recognized as nexus repo

Hi to all, I've a problem with nexus repository, I'm able to deploy my code on repository, but I would to download the robots code to another pc to collaborate with my colleague. In Maven settings I'm getting an error on update of appian rpa nexus repo, I attach here a screenshot, with the message: "Repository is non nexus repo, or does not indexed". How can I resolve this problem? I use IntelliJ IDEA Community

Thank you

 

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