What does this error message mean?

Has anyone seen this error message before?

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Yes, when you (or someone else) opens a session on the RStudio server from another browser or browser tab, using the same user, the first session gets disconnected.

Thank you for your reply.

We had ten people all connected to the same wifi but using separate laptops and logged in with different accounts when we encountered this issue.

We were using separate users on separate laptops.