Firebase exception:Object Does Not Exist

I was uploading a image to Firebase Storage and this error keeps coming

E/StorageException: StorageException has occurred. Object does not exist at location. Code: -13010 HttpResult: 404 E/StorageException: { "error": { "code": 404, "message": "Not Found. Could not get object",
"status": "GET_OBJECT" }} java.io.IOException: { "error": { "code": 404, "message": "Not Found. Could not get object", "status": "GET_OBJECT" }}

This is my code:

StorageReference postimage_path=firebaseStorage.child("Post Image").child(random+".jpg");

postimage_path.putFile(newposturi);
postimage_path.getDownloadUrl().addOnCompleteListener(new OnCompleteListener<Uri>() {
    @Override
    public void onComplete(@NonNull Task<Uri> task) {
        if(task.isSuccessful())
        {

            Uri download_url=task.getResult();
            Map<String,String> postmap=new HashMap<>();
            postmap.put("download url",download_url.toString());
            postmap.put("Description",post);
            postmap.put("user_id",currentuser);
            postmap.put("timestamp",""+FieldValue.serverTimestamp());
            postfirestore.collection("Posts").add(postmap).addOnCompleteListener(new OnCompleteListener<DocumentReference>() {
                @Override
                public void onComplete(@NonNull Task<DocumentReference> task) {
                    if(task.isSuccessful()){
                        Toast.makeText(PostActivity.this, "Post Successful", Toast.LENGTH_SHORT).show();
                        Intent intent=new Intent(PostActivity.this,MainActivity.class);
                        startActivity(intent);
                        finish();
                    }

                    else{
                    String error=task.getException().getMessage();
                    Toast.makeText(PostActivity.this, "Error while Posting :"+error, Toast.LENGTH_SHORT).show();}
                    newpostprogress.setVisibility(View.INVISIBLE);
                }
            });
        }