Unable to converted the selected file to base64 in react-native:0.78.0

[gkasireddy202]

Platform: iOS
Picker Version: "@react-native-documents/picker": "^10.1.1",

import {pick,types,errorCodes,isErrorWithCode} from '@react-native-documents/picker';
import RNFS from 'react-native-fs';

try {
const res = await pick({
type: [types.allFiles],
mode:'open',
});
RNFS.readFile(res[0].uri, 'base64').then((base64String) => {

      console.log(base64String)
    })
    .catch((err) => {
       console.log(err)
    });
} catch (err) {
    if (isErrorWithCode(err)) {
       console.log(errorCodes.OPERATION_CANCELED)
    } 
}