"self is a Clock" is an imprecise statement. Did you mean that it is an instance of the Clock class or that it is the Clock class itself?

On Tue, Sep 1, 2020 at 10:33 AM Roelof Wobben <r.wobben@home.nl> wrote:

Op 1-9-2020 om 19:21 schreef Richard Sargent:

What is the value of self when the error occurred? The debugger should show you this.

self is a Clock