Check the argument list in the call against the procedure declaration or definition.
The index specification is interpreted as an argument but neither an index nor an argument is expected, so the error occurs. Remove the index specification, or follow the procedure for creating a control array. Set the Index property to a nonzero value in the control's Properties window at design time.
Assigning a value to a property is the same as passing the value as an argument to the object's Property Let procedure. Properly define the Property Let procedure; it must have one more argument than the corresponding Property Get procedure. If the property is meant to be read-only, you can't assign a value to it.
For additional information, select the item in question and press F1 (in Windows) or HELP (on the Macintosh).
Function Statement | Sub Statement