Billionmail/BillionMail · error

error marshalling style config: %v

Error message

error marshalling style config: %v

What it means

Raised in GetStyleConfig while seeding a missing style_config.json: the built-in default StyleConfig (accent/text/background colors, fonts) could not be serialized by json.MarshalIndent. Since the default struct is hard-coded and JSON-safe, this is effectively unreachable defensive code; a struct regression (unsupported field type) is the only realistic trigger.

Source

Thrown at core/internal/service/askai/project.go:541

	filename := fmt.Sprintf(PRODUCT_CONFIG_PATH+"/%s/style_config.json", Domain)
	if !public.FileExists(filename) {
		styleConfigDefault := StyleConfig{
			AccentColor:         "#007bff",           // Default accent color
			TextColor:           "#000000",           // Default text color
			PageBackground:      "#ffffff",           // Default page background color
			ContainerBackground: "#f8f9fa",           // Default container background color
			LinkSocialColor:     "#007bff",           // Default social link color
			LinkFooterColor:     "#6c757d",           // Default footer link color
			HeadingFont:         "Arial, sans-serif", // Default heading font
			BodyFont:            "Arial, sans-serif", // Default body font
			UpdateTime:          public.GetNowTime(), // Current time as update time
		}
		// If the style config file does not exist, return a default style config
		// This allows the system to handle cases where the style configuration has not been set up yet
		// and avoids errors when trying to read a non-existent file.
		styleConfigJson, err := json.MarshalIndent(styleConfigDefault, "", "  ")
		if err != nil {
			return StyleConfig{}, fmt.Errorf("error marshalling style config: %v", err)
		}
		err = os.WriteFile(filename, styleConfigJson, 0644)
		if err != nil {
			return StyleConfig{}, fmt.Errorf("error saving style config file: %v", err)
		}
		return styleConfigDefault, nil
	}
	data, err := os.ReadFile(filename)
	if err != nil {
		return StyleConfig{}, fmt.Errorf("error reading style config file: %v", err)
	}

	var config StyleConfig
	err = json.Unmarshal(data, &config)
	if err != nil {
		return StyleConfig{}, fmt.Errorf("error unmarshalling style config: %v", err)
	}
	return config, nil

View on GitHub (pinned to fc36c76c05)

Solutions

1. Treat this error as a code-regression signal: diff StyleConfig for newly added non-serializable fields
2. Keep StyleConfig limited to string/int64 fields or annotate complex fields with json:"-"
3. Add a test asserting the default StyleConfig marshals successfully

When it happens

Trigger: Thrown at core/internal/service/askai/project.go:541 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Billionmail/BillionMail@fc36c76c05 (2026-09-05). Data as JSON: /api/errors/c92d771e4703fcb7. Report an issue: GitHub.