Cannot read property 'unload' of undefined

[dccarmo]

Description

Possibly related to: #595

I'm running into this error and I'm not sure how to fix it. Printing llm.error doesn't work because it errors out before it gets the chance.

Steps to reproduce

Here's what I'm doing:

import { useLLM, LLAMA3_2_1B } from "react-native-executorch";

export default function Screen() {
  const llm = useLLM({ model: LLAMA3_2_1B });

  console.log("llm.error", llm.error);

  React.useEffect(() => {
    console.log("Dowloading: ", llm.downloadProgress);
  }, [llm.downloadProgress]);
}

Snack or a link to a repository

No response

React Native Executorch version

0.5.15

React Native version

0.81.5

Platforms

iOS

JavaScript runtime

None

Workflow

Expo Dev Client

Architecture

Fabric (New Architecture)

Build type

Debug mode

Device

iOS simulator

Device model

No response

AI model

No response

Performance logs

No response

Acknowledgements

Yes

[IgorSwat]

@dccarmo
Can you please provide some more informations about your project setup and structure? I tried to reproduce the error following your steps, but I did not get any errors.

I suspect the issue might be parent component with useLLM hook unmounting quicker than it should, and before even async model loading function gets executed, but it's hard to determine with just the information provided.

[chmjkb]

Hey @dccarmo, are you by any chance using Expo 54?

[dccarmo]

Hey @dccarmo, are you by any chance using Expo 54?

Yes, I was testing using Expo 54. Do you think it's related?

[chmjkb]

If so, then I'm pretty sure this is the reason. Expo SDK 54 includes a new FileSystem API causing our model fetching logic to be invalid, and hence causing this error (In the console you should also see a warning from Expo saying that certain APIs from the expo-file-system package are deprecated).

We will fix it, but for the time being you can change all expo-file-system imports to expo-file-system/legacy in the following files:

1. src/controllers/LLMController.ts
2. src/utils/ResourceFetcher.ts
3. src/utils/ResourceFetcherUtils.ts
4. src/constants/directories.ts