owncloud: errorhandling for locked files added

wiki/owncloud.md

@@ -121,3 +121,16 @@ docker run --name owncloudcli \
 	-e URL='https://subdomain.domain.tld' \
 	-d tiynger/owncloudclient
 ```
+
+## Error handling
+
+### Problems with a locked file
+It is possible that you can't remove or move a locked file.
+If this problem doesn't resolve after a restart you can try to disable locking in the owncloud config.
+This is done by adding the line `'filelocking.enabled' => false,` into the file `config/config.php`.
+Then try to resolve the error.
+Afterwards enable locking again by removing the added line.
+
+The reason I choose this process over editing the database file, is ease of use.
+The editing of the database is much more time consuming especially if run with docker.
+