B4X FEED firebase storage: upload and delete done but download error

[practicalsoft]

in the firebase storage my app can upload and can delete a file but download error:

(IOException) java.ioException: could not open resulting stream.

My rules:

rules_version = '2';
service firebase.storage {
match /b/*****.appspot.com/o {
match /public/{allPaths=**} {
allow read, write;
}
match /pread/{allPaths=**} {
allow read;
}
match /pwrite/{allPaths=**} {
allow write;
} }}

B4X:

Starter.storage.DownloadFile("/public/r.txt", File.DirInternal, "r.txt")
i upoaded r.txt to public folder.

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