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This error means that the UI is unable to contact the REST API listed at [rest-api-url] and/or the response from that [rest-api-url] is unexpected (as it doesn't contain the "_links" to the endpoints available at that REST API).  A valid DSpace [rest-api-url] will respond with JSON similar to our demo API at https://api7.dspace.org/server/apiThe problem is likely in the

Unfortunately, this is a generic error message which simply says your frontend cannot communicate with your backend.  It may be caused by a variety of installation scenarios...these are a few we've discovered so far:

• A possible configuration issue in the frontend or backend.
  • Check 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.
  • Check the "dspace.ui.url" configuration of your backend & verify it corresponds to the public URL of the User Interface (i.e. the exact same URL you use in your browser)
• A possible SSL certificate issue. 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.
• Something blocking access to the REST API. This may be a proxy issue, a firewall issue, or something else generally blocking the port (e.g. port 443 for SSL).
  • Verify that you can access the REST API from the machine where your UI is running.  For example try "curl" or "wget" to verify the REST API is returning expected JSON similar to our demo API at https://api7.dspace.org/server/api
  • In most production scenarios, your REST API should be publicly accessible on the web, unless you are guaranteed that all your DSpace users will access the site behind a VPN or similar.  So, this "No _links section found" error may also occur if you are accessing the UI from a client computer/web browser which is unable to access the REST API.

"RangeError: Maximum call stack size exceeded"

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