unsupported: text/plain

IQuadDestination.js?eac7:20 Uncaught (in promise) Error: Could not update https://remo.solid.tschenten.ch/profile/card (HTTP status 415):
Unsupported patch content type: text/plain

    at validateHttpResponse (IQuadDestination.js?eac7:20:1)
    at async QuadDestinationPatchSparqlUpdate.wrapSparqlUpdateRequest (QuadDestinationPatch…Update.js?f5aa:54:1)
    at async Promise.all (:3000/index 0)
validateHttpResponse	@	IQuadDestination.js?eac7:20
Promise.then (async)
asyncGeneratorStep	@	index.tsx?07ff:9
_next	@	index.tsx?07ff:9
eval	@	index.tsx?07ff:9
eval	@	index.tsx?07ff:9
insertQueryHandler	@	index.tsx?07ff:55
callCallback	@	react-dom.development.js?ac89:3945
invokeGuardedCallbackDev	@	react-dom.development.js?ac89:3994
invokeGuardedCallback	@	react-dom.development.js?ac89:4056
invokeGuardedCallbackAndCatchFirstError	@	react-dom.development.js?ac89:4070
executeDispatch	@	react-dom.development.js?ac89:8243
processDispatchQueueItemsInOrder	@	react-dom.development.js?ac89:8275
processDispatchQueue	@	react-dom.development.js?ac89:8288
dispatchEventsForPlugins	@	react-dom.development.js?ac89:8299
eval	@	react-dom.development.js?ac89:8508
batchedEventUpdates$1	@	react-dom.development.js?ac89:22396
batchedEventUpdates	@	react-dom.development.js?ac89:3745
dispatchEventForPluginEventSystem	@	react-dom.development.js?ac89:8507
attemptToDispatchEvent	@	react-dom.development.js?ac89:6005
dispatchEvent	@	react-dom.development.js?ac89:5924
unstable_runWithPriority	@	scheduler.development.js?bcd2:468
runWithPriority$1	@	react-dom.development.js?ac89:11276
discreteUpdates$1	@	react-dom.development.js?ac89:22413
discreteUpdates	@	react-dom.development.js?ac89:3756
dispatchDiscreteEvent	@	react-dom.development.js?ac89:5889