Cannot initialize the model

[XinyuGroceryStore]

I'm developing an Android app using llama.cpp on C++ layer and JNI to interact with java UI. My issue is that the model connot be initialized properly.

Here is what I have done

Firstly, I built .so files and linked them with my Android project. (I tried the .so files with related bin via ADB, and it worked)
Secondly, I wrote code below to init model:
code in llm.cpp

bool init_model(const std::string &model_path) {

    // load dynamic backends
    ggml_backend_load_all();

    // initialize the model
    llama_model_params model_params = llama_model_default_params();
    model_params.n_gpu_layers = 0;

    llama_model *model_inited = llama_model_load_from_file(model_path.c_str(), model_params);
    if (!model) {
        LOGE("%s: error: unable to load model at %s\n", __func__, model_path.c_str());
        return false;
    }
    model = model_inited;
//    prev_len = 0;
//    is_inferring = false;
    return true;
}

code in llmJNI.cpp

extern "C" 
JNIEXPORT void JNICALL
Java_com_example_demojavacpp_MainActivity_initLLM(JNIEnv* env, jobject thiz) {
    std::string model_path = "/data/data/com.example.demojavacpp/files/gguf_models/Phi-3-mini-4k-instruct-q4.gguf";

    // init model
    if(!init_model(model_path)){
        LOGE("Model init failed!");
    };

    //init ctx
    int n_ctx = 2048;
    if(!init_context(n_ctx)){
        LOGE("ctx init failed!");
    }

    // init sampler
    if(!init_sampler()){
        LOGE("smpl init failed!");
    }
}

The catlog said:

2025-02-05 16:29:46.575 12775-12775 llm com.example.demojavacpp E init_model: error: unable to load model at /data/data/com.example.demojavacpp/files/gguf_models/Phi-3-mini-4k-instruct-q4.gguf
2025-02-05 16:29:46.575 12775-12775 llmJNI com.example.demojavacpp E Model init failed!

Can someone help me a bit? Any ideas are welcomed!