418 No Reason Phrase


I wrote this app some time ago: GitHub - strukturart/o.map: Open Street Map app - KaiOS which, as a standard, obtains the OSM map data: https://tile.openstreetmap.org/16/67934/46153.png. For a few days now I have been receiving the following error message when requesting: 418 No Reason Phrase. what could be the reason for this ?

greetings john