core data - Swift NSManagedObjects do not support mutableSetValueForKey -

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i practicing tute task on swift coredata. reminder app, have these entities in core data file:

and error in viewdidload() function:

var reminderlist: nsmutablearray  //in viewdidload() {     super.viewdidload()      //fetchrequest code blocks      self.reminderlist = nsmutablearray(array: (currentreminders?.members?.allobjects) as! [reminder])

i got error message: 'nsmanagedobjects of entity 'reminderlist' not support -mutablesetvalueforkey: property 'members'' , app crashed.

this problem because of mistake in setting relationship between entities in coredata. check see if constraints set to-one/many.


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