Question

Association class with namespace showing as syntax error.
version: 1.2021.01

@startuml
set namespaceSeparator ::
namespace A {
    class A1{
    }
}
namespace B {
    class B1{
    }
    class B2{
    }
    B1 -- B2
}
(B::B1,B::B2) - A::A1
@enduml