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The problem is likely in the "rest" section of your environment.*.ts configuration file for the User Interface.  That configuration section defines which REST API the UI will attempt to use.  If the settings do NOT map to a valid DSpace REST API, then you will see this "No _links section found.." error.

This issue may also appear if the REST API's SSL Certificate is either untrusted (by the frontend) or expired.  See also "Using a Self-Signed SSL Certificate causes the Frontend to not be able to access the Backend" common issue listed below.

"RangeError: Maximum call stack size exceeded"

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