Subscript out of range

Hey Guys,

I have an array declared and not initialized as:
Public UserListArray() As String.

Along the coding line I have need to delete portions of this array using this code:

For i = icboUserList to UserListSize - 1
UserListArray(i) = UserListArray(i+3)
Next i

But I receive an error, Run-time error '9': Subscript out of range. Does this make sense to anyone and how can I correct it?

 

Found that using LBound and UBound helped to determine the lower and upper parameters of my array which prohibited me from overstepping my array boundaries.

LBound(UserListArray)
UBound(UserListArray)