### Steps to reproduce

1. Begin of the insertionCreate a nextcloud storage and connect it to a project, using an automatically managed project folder

2. Make sure that that project folder was created, e.g. by uploading a file into it

3. DeleteEnd of the insertion Begin of the deletion OpenEnd of the deletion the Begin of the deletion "Nextcloud Stage"End of the deletion storage Begin of the insertion

4. Create another nextcloud storage and configure itEnd of the insertion Begin of the deletion fromEnd of the deletion the Begin of the insertionsame way

1. (You should now have a conflicting hidden folder for theEnd of the insertion Begin of the deletion side menu in anyEnd of the deletion project Begin of the insertionstorage and thus can't create a new folder forEnd of the insertion that Begin of the insertionstorage)

5. Go to the project where the storage was added and use the menu link ("\[name of your storage\]") to openEnd of the insertion Begin of the deletion hasEnd of the deletion it Begin of the deletion enabled, e.g. https://qa.openproject-stage.com/projects/cecile-demo-project/End of the deletion


### What is the buggy behavior?

HTTP 500 Begin of the insertionerror with no specific informationEnd of the insertion Begin of the deletion (Apparently OP is expecting JSON, but Nextcloud is returning XML)End of the deletion

### What is the expected behavior?

Opening the storage Begin of the insertionfails with a proper error message, explaining what the problem isEnd of the insertion

### AppSignal

[https://appsignal.com/openproject-gmbh/sites/678fa146338a5d816f8d696c/exceptions/incidents/896](https://appsignal.com/openproject-gmbh/sites/678fa146338a5d816f8d696c/exceptions/incidents/896)

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