Hi, there is a bug on the clock widget and clock app to, both can not be opened… I’m using the MK71.2-nx563j-201803021346-NIGHTLY version
have you tried clear data?
you need wipe all data or wipe the clock’s data
This is usually the result of install GApps after the phone is start. The Google clock replaces the Mokee clock, Data incompatibility between the two.