Uncaught Error: No Storage Bucket defined in Firebase Options. (WEB)

I tried to upload a file(image) on firebase storage. but it consoles an error saying "Uncaught Error: No Storage Bucket defined in Firebase Options." . This is my code

const fileUpBtn = document.getElementById('photoUpload');
const selectFile = document.getElementById('selectedFile');
const postIt = document.getElementById('postIt');

fileUpBtn.addEventListener('click',function(){
selectFile.click();
}
);
selectFile.addEventListener('change',function(e){

var file=e.target.files[0];
var filename = file.name;
console.log('/postPic/'+filename);
var storeLocation = storage.ref('/postPic/'+filename);
var uploadTask=storeLocation.put(file);  
});

I tried by allowing storage for any users but that situation also consoles this error.enter image description here