FORALL alias variable is not of same data type: <name>
You reused a ForAll reference variable, but the array, list, or collection being iterated over is of a different data type than the collection previously iterated over using the same variable. For example:
Dim X(10) As Integer
Dim Y(10) As Long
ForAll I In X
' ...
End ForAll
ForAll I In Y ' Error. I is an Integer before;
' it can't be Long here.
End ForAll
Use a different variable: either an existing ForAll reference variable of the correct type, or a new variable.