why i need RegisteredStyle type?

[fantasy525]

Error:(26, 11) TS2322: Type 'RegisteredStyle<{ fontSize: number; textAlign: string; margin: number; }>' is not assignable to type 'StyleProp<TextStyle>'. Type 'RegisteredStyle<{ fontSize: number; textAlign: string; margin: number; }>' is not assignable to type 'RecursiveArray<false | TextStyle | RegisteredStyle<TextStyle> | null | undefined>'. Property 'length' is missing in type 'Number & { __registeredStyleBrand: { fontSize: number; textAlign: string; margin: number; }; }'.
You did not declare the type of the style file when creating the style in hello.tsx in your readme file,
Why did I have this error when I created my own style