nektos/act · error

incorrect container platform option '%s'

Error message

incorrect container platform option '%s'

What it means

Error "incorrect container platform option '%s'" thrown in nektos/act.

Source

Thrown at pkg/container/docker_run.go:452

var platSpecs *specs.Platform
if supportsContainerImagePlatform(ctx, cr.cli) && cr.input.Platform != "" {
	desiredPlatform := strings.SplitN(cr.input.Platform, `/`, 2)

	if len(desiredPlatform) != 2 {
		return fmt.Errorf("incorrect container platform option '%s'", cr.input.Platform)
	}

	platSpecs = &specs.Platform{
		Architecture: desiredPlatform[1],
		OS:           desiredPlatform[0],
	}
}

View on GitHub (pinned to 4f41128141)

Solutions

1. Use a valid platform value such as linux/amd64 or linux/arm64 for --container-architecture.
2. Leave the platform option empty to use the host default platform.

When it happens

Trigger: Thrown at pkg/container/docker_run.go:452 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of nektos/act@4f41128141 (2026-08-15). Data as JSON: /api/errors/849fae59ba8b7fc0. Report an issue: GitHub.