portainer/portainer · error

Invalid custom template title

Error message

Invalid custom template title

What it means

Error "Invalid custom template title" thrown in portainer/portainer.

Source

Thrown at api/http/handler/customtemplates/customtemplate_update.go:70

	// Deprecated: use SourceID instead. Password used in basic authentication or token used in token authentication. Required when RepositoryAuthentication is true.
	RepositoryPassword string `example:"myGitPassword"`
	// Path to the Stack file inside the Git repository
	ComposeFilePathInRepository string `example:"docker-compose.yml" default:"docker-compose.yml"`
	// Content of stack file
	FileContent string `validate:"required"`
	// Definitions of variables in the stack file
	Variables []portainer.CustomTemplateVariableDefinition
	// Deprecated: use SourceID instead. TLSSkipVerify skips SSL verification when cloning the Git repository.
	TLSSkipVerify bool `example:"false"`
	// IsComposeFormat indicates if the Kubernetes template is created from a Docker Compose file
	IsComposeFormat bool `example:"false"`
	// EdgeTemplate indicates if this template purpose for Edge Stack
	EdgeTemplate bool `example:"false"`
}

func (payload *customTemplateUpdatePayload) Validate(r *http.Request) error {
	if len(payload.Title) == 0 {
		return errors.New("Invalid custom template title")
	}

	if payload.Type != portainer.KubernetesStack && payload.Platform != portainer.CustomTemplatePlatformLinux && payload.Platform != portainer.CustomTemplatePlatformWindows {
		return errors.New("Invalid custom template platform")
	}

	if payload.Type != portainer.KubernetesStack && payload.Type != portainer.DockerSwarmStack && payload.Type != portainer.DockerComposeStack {
		return errors.New("Invalid custom template type")
	}

	if len(payload.Description) == 0 {
		return errors.New("Invalid custom template description")
	}

	if !IsValidNote(payload.Note) {
		return errors.New("Invalid note. <img> tag is not supported")
	}

View on GitHub (pinned to 17e74456ff)

When it happens

Trigger: Thrown at api/http/handler/customtemplates/customtemplate_update.go:70 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of portainer/portainer@17e74456ff (2026-08-26). Data as JSON: /api/errors/47307d86950dcf23. Report an issue: GitHub.