Error: stacker exited with code 3 stacker version v0.40.4-acffdc1 usernsexec-ing [u 0 1001 1 1 165537 65535 g 0 127 1 1 165537 65535 -- /opt/hostedtoolcache/stacker/0.40.4/x64/stacker --internal-userns --debug convert --docker-file test/Dockerfile --output-file stacker.yaml --substitute-file stacker-subs.yaml] stacker version v0.40.4-acffdc1 No help topic for 'convert' error: exit status 3 stackerbuild.io/stacker/pkg/container.MaybeRunInNamespace /stacker-tree/pkg/container/userns.go:102 main.main.func3 /stacker-tree/cmd/stacker/main.go:299 github.com/urfave/cli.(*App).Run /stacker-tree/.build/gopath/pkg/mod/github.com/urfave/[email protected]/app.go:264 main.main /stacker-tree/cmd/stacker/main.go:304 runtime.main /usr/lib/go/src/runtime/proc.go:267 runtime.goexit /usr/lib/go/src/runtime/asm_amd64.s:1650