Numpy删除对象数组中的数组行

I am trying to delete rows from arrays which are stored inside an object array in numpy. However as you can see it complains that it cannot broadcast the smaller array into the larger array. Works fine when done directly to the array. What is the issue here? Any clean way around this error other than making a new object array and copying one by one until the array I want to modify?I am trying to delete rows from arrays which ar