I got the same error when I updated to 21.0.1, and for me, it turned out to be the "external storage" application (which I'm using to get access to SMB shares in the Nextcloud app)   I got this fixed by simply removing the "files_external" folder found in: \\YourServer\appdata\nextcloud\www\nextcloud\apps\ However, now I can't see the External Storages- application within the appstore of NC, so I'm trying to figure out how to re-install said app in order to access the SMB sha
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