One VBA/Macro to check all boxes from other worksheets?

Apologies, the module name was 'VBAProject' and not 'Module 2 (Code)'. I've tried running the code below but this error came up: "For Each can only iterate over a collection object or an array".

Sub test()
Dim ws As Worksheet
For Each ws In VBAProject
    ws.Activate
    Call CheckAll
Next ws
End Sub