HarmonyOS 鸿蒙Next：An implementation cannot be declared in ambient contexts. The size of programs is expected to be 8, but is 7，求解答

自定义组件
@Component
export declare struct NavBar {
  barWidth?: Length;
  barHeight?: Length;
  barBackgroundColor?: ResourceColor;
  title?: string;
  titleAttribute: TitleAttribute;
  onTitleClick?: () => void;
  @BuilderParam
  titleLayout?: () => void;
  @BuilderParam
  leftMenuLayout?: () => void;
  @BuilderParam
  rightMenuLayout?: () => void;
  leftMenuType?: MenuType;
  rightMenuType?: MenuType;
  leftText?: string | Resource;
  left2Text?: string | Resource;
  rightText?: string | Resource;
  right2Text?: string | Resource;
  leftMenuAttribute?: BarMenuAttribute;
  private lMenuAttribute : BarMenuAttribute;
  leftMenu2Attribute?: BarMenuAttribute;
  private lMenu2Attribute : BarMenuAttribute;
  rightMenuAttribute?: BarMenuAttribute;
  private rMenuAttribute : BarMenuAttribute;
  rightMenu2Attribute?: BarMenuAttribute;
  private rMenu2Attribute : BarMenuAttribute;
  leftMenuMargin?: Length;
  leftMenuBgColor?: ResourceColor;
  rightMenuBgColor?: ResourceColor;
  rightMenuMargin?: Length;
  leftMenuWidth?: Length;
  leftMenuHeight?: Length;
  rightMenuWidth?: Length;
  rightMenuHeight?: Length;
  onLeftClick?: () => void;
  onLeftTextClick?: (position?: number) => void;
  onLeftImageClick?: (position?: number) => void;
  onRightClick?: () => void;
  onRightTextClick?: (position?: number) => void;
  onRightImageClick?: (position?: number) => void;
  leftIcon?: PixelMap | ResourceStr | DrawableDescriptor;
  left2Icon?: PixelMap | ResourceStr | DrawableDescriptor;
  rightIcon?: PixelMap | ResourceStr | DrawableDescriptor;
  right2Icon?: PixelMap | ResourceStr | DrawableDescriptor;
  titleAlignRules: AlignRuleOption;
  hideLeftMenu?: boolean;
  hideTitle?: boolean;
  hideRightMenu?: boolean;
  isAvoidanceNavigation?: boolean;
  private _privateAvoidanceHeight ?: Length;
  barAttribute?: BarAttribute;
  aboutToAppear(): void;
  private setNavBarAttribute : BarAttribute;
  private setMenuAttribute : BarMenuAttribute;
  build(): void;
  @Builder
  left2TextView(a3: NavBar): void;
  @Builder
  rightTextView(p2: NavBar): void;
  @Builder
  right2TextView(e2: NavBar): void;
  @Builder
  leftTextView(t1: NavBar): void;
  @Builder
  left2IconView(i1: NavBar): void;
  @Builder
  leftIconView(x: NavBar): void;
  @Builder
  rightIconView(m: NavBar): void;
  @Builder
  right2IconView(b: NavBar): void;
}

运行报错，请帮忙看看这个问题谢谢