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Nightscout failure: unable to do REST API Download java.lang.NullPointerException

I am trying to downstream my BG data from xDrip+ to my Nightscout (azure) website. Hereby I get the following error: "Nightscout failure: Unable to do REST API Download java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.startsWith(java.lang.string) on a null object reference Attempt to invoke virtual method 'boolean java.lang.String.startsWith(java.lang.String) on a null object reference url: websitename.azurewebsites.net/"
Can somebody please explain me what this error means?