Qt for WebAssembly: filesystembrowser Application exit (Error: FS error)

developer's console

Failed to load resource: the server responded with a status of 403 (Forbidden)
2qtbase/scribble/scribble.html:1 Uncaught Please compile your program with async support in order to use asynchronous operations like emscripten_sleep
2qtbase/scribble/qtloader.js:382 Only C and default locale supported with the posix collation implementation
qtbase/scribble/qtloader.js:382 Case insensitive sorting unsupported in the posix collation implementation
qtbase/scribble/qtloader.js:382 Numeric mode unsupported in the posix collation implementation
qtbase/scribble/scribble.html:1 Uncaught Please compile your program with async support in order to use asynchronous operations like emscripten_sleep
2qtbase/scribble/qtloader.js:382 Only C and default locale supported with the posix collation implementation
qtbase/scribble/qtloader.js:382 Case insensitive sorting unsupported in the posix collation implementation
qtbase/scribble/qtloader.js:382 Numeric mode unsupported in the posix collation implementation
qtbase/scribble/qtloader.js:382 Empty filename passed to function
2qtbase/scribble/qtloader.js:382 Only C and default locale supported with the posix collation implementation
qtbase/scribble/qtloader.js:382 Case insensitive sorting unsupported in the posix collation implementation
qtbase/scribble/qtloader.js:382 Numeric mode unsupported in the posix collation implementation
qtbase/scribble/scribble.html:1 [.WebGL-0x134518a65300]RENDER WARNING: there is no texture bound to the unit 0
2qtbase/scribble/qtloader.js:382 Only C and default locale supported with the posix collation implementation
qtbase/scribble/qtloader.js:382 Case insensitive sorting unsupported in the posix collation implementation
qtbase/scribble/qtloader.js:382 Numeric mode unsupported in the posix collation implementation
qtbase/scribble/scribble.html:1 Uncaught Please compile your program with async support in order to use asynchronous operations like emscripten_sleep
2qtbase/scribble/qtloader.js:382 Only C and default locale supported with the posix collation implementation
qtbase/scribble/qtloader.js:382 Case insensitive sorting unsupported in the posix collation implementation
qtbase/scribble/qtloader.js:382 Numeric mode unsupported in the posix collation implementation
qtbase/scribble/qtloader.js:382 Empty filename passed to function
2qtbase/scribble/qtloader.js:382 Only C and default locale supported with the posix collation implementation
qtbase/scribble/qtloader.js:382 Case insensitive sorting unsupported in the posix collation implementation
qtbase/scribble/qtloader.js:382 Numeric mode unsupported in the posix collation implementation
2qtbase/scribble/qtloader.js:382 Only C and default locale supported with the posix collation implementation
qtbase/scribble/qtloader.js:382 Case insensitive sorting unsupported in the posix collation implementation
qtbase/scribble/qtloader.js:382 Numeric mode unsupported in the posix collation implementation
2qtbase/scribble/qtloader.js:382 Only C and default locale supported with the posix collation implementation
qtbase/scribble/qtloader.js:382 Case insensitive sorting unsupported in the posix collation implementation
qtbase/scribble/qtloader.js:382 Numeric mode unsupported in the posix collation implementation
qtdeclarative/views/qtloader.js:372 [object Object]
qtloader.js:382 QQmlApplicationEngine failed to load component
qtloader.js:382 qrc:/main.qml:56 Type ApplicationWindow unavailable
qtloader.js:382 qrc:/qt-project.org/imports/QtQuick/Controls/ApplicationWindow.qml:40 module "QtQml" is not installed
qtloader.js:382 <message collected>
qtloader.js:382 exception thrown: Error: FS error,Error
at Object.ensureErrnoError (eval at completeLoadEmscriptenModule (https://s3.eu-west-2.amazonaws.com/wasm-qt-examples/last/qtquickcontrols/filesystembrowser/qtloader.js:443:14), <anonymous>:1:70657)
at Object.staticInit (eval at completeLoadEmscriptenModule (https://s3.eu-west-2.amazonaws.com/wasm-qt-examples/last/qtquickcontrols/filesystembrowser/qtloader.js:443:14), <anonymous>:1:70877)
at eval (eval at completeLoadEmscriptenModule (https://s3.eu-west-2.amazonaws.com/wasm-qt-examples/last/qtquickcontrols/filesystembrowser/qtloader.js:443:14), <anonymous>:1:288261)
at eval (<anonymous>)
at completeLoadEmscriptenModule (https://s3.eu-west-2.amazonaws.com/wasm-qt-examples/last/qtquickcontrols/filesystembrowser/qtloader.js:443:14)
at https://s3.eu-west-2.amazonaws.com/wasm-qt-examples/last/qtquickcontrols/filesystembrowser/qtloader.js:332:13
qtloader.js:382 QQmlApplicationEngine failed to load component
qtloader.js:382 qrc:/main.qml:56 Type ApplicationWindow unavailable
qtloader.js:382 qrc:/qt-project.org/imports/QtQuick/Controls/ApplicationWindow.qml:40 module "QtQml" is not installed
qtloader.js:382 <message collected>
qtloader.js:382 exception thrown: Error: FS error,Error
at Object.ensureErrnoError (eval at completeLoadEmscriptenModule (https://s3.eu-west-2.amazonaws.com/wasm-qt-examples/last/qtquickcontrols/filesystembrowser/qtloader.js:443:14), <anonymous>:1:70657)
at Object.staticInit (eval at completeLoadEmscriptenModule (https://s3.eu-west-2.amazonaws.com/wasm-qt-examples/last/qtquickcontrols/filesystembrowser/qtloader.js:443:14), <anonymous>:1:70877)
at eval (eval at completeLoadEmscriptenModule (https://s3.eu-west-2.amazonaws.com/wasm-qt-examples/last/qtquickcontrols/filesystembrowser/qtloader.js:443:14), <anonymous>:1:288261)
at eval (<anonymous>)
at completeLoadEmscriptenModule (https://s3.eu-west-2.amazonaws.com/wasm-qt-examples/last/qtquickcontrols/filesystembrowser/qtloader.js:443:14)
at https://s3.eu-west-2.amazonaws.com/wasm-qt-examples/last/qtquickcontrols/filesystembrowser/qtloader.js:332:13
qtloader.js:382 QQmlApplicationEngine failed to load component
qtloader.js:382 qrc:/main.qml:56 Type ApplicationWindow unavailable
qtloader.js:382 qrc:/qt-project.org/imports/QtQuick/Controls/ApplicationWindow.qml:40 module "QtQml" is not installed
qtloader.js:382
qtloader.js:382 exception thrown: Error: FS error,Error
at Object.ensureErrnoError (eval at completeLoadEmscriptenModule (https://s3.eu-west-2.amazonaws.com/wasm-qt-examples/last/qtquickcontrols/filesystembrowser/qtloader.js:443:14), <anonymous>:1:70657)
at Object.staticInit (eval at completeLoadEmscriptenModule (https://s3.eu-west-2.amazonaws.com/wasm-qt-examples/last/qtquickcontrols/filesystembrowser/qtloader.js:443:14), <anonymous>:1:70877)
at eval (eval at completeLoadEmscriptenModule (https://s3.eu-west-2.amazonaws.com/wasm-qt-examples/last/qtquickcontrols/filesystembrowser/qtloader.js:443:14), <anonymous>:1:288261)
at eval (<anonymous>)
at completeLoadEmscriptenModule (https://s3.eu-west-2.amazonaws.com/wasm-qt-examples/last/qtquickcontrols/filesystembrowser/qtloader.js:443:14)
at https://s3.eu-west-2.amazonaws.com/wasm-qt-examples/last/qtquickcontrols/filesystembrowser/qtloader.js:332:13