Calling window.webkitRequestFileSystem twice causes first call not to be bypassed - html

Question

Have an interesting problem ... I am making a BB10 application (I know) and am using the window.webkitRequestFileSystem call to a) provide a list of local files that this application has downloaded and b) read one of those files and display the contents - nothing crazy.
Individually, I can get both calls a) and b) to work; however, when I place them in the same function hoping to both display a list of files and read one of them, it causes the reading one not to fire at all.
In the example below, regardless of whether the listing call comes before or after the reading call, the reading call will not fire, i.e., I will never see the 'fileentry' alert.
What's going on?
function initFS(){
sharedFolder = blackberry.io.sharedFolder;
var path = sharedFolder+'/downloads';
//alert(path);
document.getElementById('plancontents').value="initialized";
window.requestFileSystem = window.requestFileSystem ||
window.webkitRequestFileSystem;
//window.requestFileSystem(window.TEMPORARY, 1024 * 1024,
//window.requestFileSystem(LocalFileSystem.PERSISTENT, 1024*1024*5,
window.webkitRequestFileSystem(window.PERSISTENT, 1024*1024*5,
function (fs) {
//fs.root.getFile(blackberry.io.sharedFolder
//fs.root.getFile('file:///accounts/1000/shared/downloads/filename.xml', {create: false},
fs.root.getFile(sharedFolder+'/downloads/filename.xml', {create: false},
function (fileEntry) {
alert("fileentry");
fileEntry.file(function (file) {
var reader = new FileReader();
//alert("trying to read file");
reader.onloadend = function (e) {
document.getElementById('plancontents').value = this.result;
};
reader.readAsText(file);
}, errorHandler);
}, errorHandler);
});
window.webkitRequestFileSystem(window.PERSISTENT, 1024*1024*5,
function (fs) {
alert('FS requested and inside');
fs.root.getDirectory(path, {}, function(dirEntry){
alert('inside getDir');
var dirReader = dirEntry.createReader();
alert('created reader');
dirReader.readEntries(function(entries) {
alert('trying to list dir');
for(var i = 0; i < entries.length; i++) {
var entry = entries[i];
if (entry.isDirectory) {
alert('Directory: ' + entry.fullPath);
}
else if (entry.isFile) {
alert('File: ' + entry.fullPath);
}
}
}, errorHandler);
}, errorHandler);
});
}