Hei,
a 500 error normally means, that the backend can't reach the frontend. You can try to run "yarn test:rest" to check, if the backend is available. Apart from this further help is difficult due to the lack of further information. I can only recommend to follow the troubleshoot guide: https://wiki.lyrasis.org/display/DSPACE/Troubleshoot+an+error
Kind regards,
Eike Löhden.
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