Xcode - "Cannot Find in Scope"

These are compiler errors informing you that Fitnessdata and addwidget are not able to be found in your current scope (that is, they are not defined anywhere within your ContentView struct), and they are also not defined in the global scope (that is, they are not defined at the top-level either). They are also not publicly defined in any frameworks that you may have imported in this file.

Just based on what can be seen in this screenshot, I think probably you have defined these properties/types in the global scope, but simply used the wrong capitalizations when referencing them (Swift is case-sensitive).