React native asyncstorage cannot get data - react-native

Question

I'm starting my react-native project with npm start. On my emulator I have installed expo to view my application. Also I'm using http://ip:19001/debugger-ui/ to debug my application in google chrome.
I don't know what I'm doing wrong but I can't get any data from asyncstorage. Can you please give me some tips how to correct this problem.
In one of my activities I store data with;
storeDataInAsync1(idSchool,year) {
try {
//await AsyncStorage.removeItem('user');
AsyncStorage.setItem('dateRange', this.props.range);
AsyncStorage.setItem('idSchool', idSchool);
AsyncStorage.setItem('school_year', year);
} catch (error) {
// Error saving data
}
}
My call to this method;
async saveMyProfil() {
var formData = new FormData();
formData.append('id_school',this.props.idSchool);
formData.append('school_year', this.props.year);
await fetch(`${api.url}/my_profile/`, {
method: 'POST',
headers: {
"Content-Type": "multipart/form-data"
},
body: formData,
}).then((response) => response.json())
.then((json) => {
console.log('Response: ' + JSON.stringify(json));
this.storeDataInAsync1(json.id_school,json.school_year);
//_storeData(json.id_school,json.school_year);
//this.doStuff(json.id_school,json.school_year);
})
.catch((error) => {
});
}
back() {
//this.storeDataInAsync();
this.saveMyProfil();
this.props.navigation.goBack();
}
In another activity there is method to retrive data;
_retrieveData = async () => {
try {
const value = await AsyncStorage.getItem('idSchool');
const year = await AsyncStorage.getItem('school_year');
if (value !== null && year !== null) {
// We have data!!
console.log('Id School: ' + value);
console.log('Year: ' + year);
}
} catch (error) {
// Error retrieving data
}
}
I call _retrieveData in;
componentDidMount() {
BackHandler.addEventListener('hardwareBackPress', this.handleBackButton);
this._retrieveData();
}