First tutorial execute fails 500

Installed contour via stable helm chart
kubernetes 1.15.1
centos 7.6
kernel 3.10.0-957.27.2.el7.x86_64
volume driver : naive

Running the first tutorial - fly -t tutorial execute -c task_hello_world.yml --verbose

Any help is appreciated

Fails with 500 internal server error

kubectl logs on web show {"error":"failed to stream in to volume","session":"4228"}}

no interesting logs on worker.

I have tried from the latest contour-charts repo with the same result