Hi, Matthew.
Thanks for reaching out. I would like to first verify if you are running on HipChat Cloud or HipChat Server / Data Center.
While the reason behind the error varies between the platforms, please have a look at the following articles that can possibly help to address the problem (specific to HipChat Server only):
If you are experiencing it on HipChat Cloud instead, please provide us with the client log after you reproduce the issue so we can analyze the log entry when the issue occurs:
Looking forward to hear from you soon.
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