Please move to a current version of ownCloud (e.g. 9.0.8 or 9.1.4) as there won't be any fixes or support for the old calendar / contacts app if the issue is caused by them.
Please move to a current version of ownCloud (e.g. 9.0.8 or 9.1.4) as there won't be any fixes or support for the old calendar / contacts app if the issue is caused by them.