In this [issue](https://github.com/facebook/react/issues/23373), when you navigate to [this app](https://next-rsc-notes.vercel.app/note/1646289027680) and inspect the sidebar in the components tab, you will get this error:

![image](https://user-images.githubusercontent.com/2735514/158241727-64eba8f9-5ac2-4aa7-bffa-ff9b3174a261.png)

 This is a user error. One of the components in the user's app thrown. However, the UI for this is confusing, because it seems like it's a DevTools error. We've gotten a lot of bug reports like this, and it would be good to differentiate between DevTools bugs and bugs in the app. For this task:

- [ ] Build the React DevTools extension locally (instructions [here](https://github.com/facebook/react/tree/main/packages/react-devtools-extensions)) and reproduce the error
- [ ] Figure out a way to have the front end be able to differentiate whether the error is a error within DevTools or within the user's app
- [ ] Design/implement a better UI to help app developers distinguish between these two cases
const idToRootMap: Map<number, number> = new Map();
   When a mount or update is in progress, this value tracks the root that is being operated on.
  let currentRootID: number = -1;
   Returns the unique ID for a Fiber or generates and caches a new one if the Fiber hasn't been seen before.
   Once this method has been called for a Fiber, untrackFiberID() should always be called later to avoid leaking.
  function getOrGenerateFiberID(fiber: Fiber): number {
    let id = null;
    if (fiberToIDMap.has(fiber)) {
      id = fiberToIDMap.get(fiber);
    } else {
      const {alternate} = fiber;
      if (alternate !== null && fiberToIDMap.has(alternate)) {
        id = fiberToIDMap.get(alternate);
      }
    }
    let didGenerateID = false;
    if (id === null) {
      didGenerateID = true;
      id = getUID();
    }
     This refinement is for Flow purposes only.
    const refinedID = ((id: any): number);
     Make sure we're tracking this Fiber
     e.g. if it just mounted or an error was logged during initial render.
    if (!fiberToIDMap.has(fiber)) {
      fiberToIDMap.set(fiber, refinedID);
      idToArbitraryFiberMap.set(refinedID, fiber);
    }
     Also make sure we're tracking its alternate,
     e.g. in case this is the first update after mount.