Can't get flows to run #1391

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I am...

• Reporting a bug
• Suggesting a new feature
• Requesting help with running my bot
• Requesting help writing plugins
• Here about something else

I am running...

• Errbot version: 6.1.1
• OS version: Windows 10
• Python version: 3.7.4
• Using a virtual environment: yes

Issue description

I am trying to develop a errbot plugin for which I want to use flows.
I have a simple flow programmed (files here), which is near the example of the documentation. Individually the !first, !second and !third commands are running, but the flow won't start. !flows start example returns "Computer says nooo. See logs for details:
Flow example doesn't exist"

Steps to reproduce

Create an errbot in a virtual enviroment, save the attached files under /plugins/err-example, start the bot and try the command "!flows start example"

Additional info

The errbot is connected to a zulip instance and runs with the zulip-connector.
My email-adress is in the BOT_ADMINS list.