Error: Feed failed! Causes may be (1) No data found for RSS feed https://rvlmxb.blumeidealhamburg.de/a0c1-output-terminal-50.html; (2) There are no items are available for this feed; (3) The RSS feed does not validate.

Please verify that the URL https://rvlmxb.blumeidealhamburg.de/a0c1-output-terminal-50.html works first in your browser and that the feed passes a validator test.