Picker valid Columns but no showing

Hello Guys, i want a Picker with two Columns. i check the columns, i get a valid result but open the App is my Picker empty. this is my code for create the PickerView

/*
     * PickerView
     */
    pickerView = Ti.UI.createView({
        zIndex : 1,
        backgroundColor : "white",
        height : "85%",
        width : "85%",
        borderWidth : 1,
        borderColor : "black",
        borderRadius : 10,
        opacity : 0
    });
 
    var modullLabel = Ti.UI.createLabel({
        top : 10,
        right : 2,
        width : "40%",
        text : "modullLabel",
        textAlign : Ti.UI.TEXT_ALIGNMENT_CENTER
    });
 
    var locationLabel = Ti.UI.createLabel({
        top : 10,
        left : 2,
        width : "40%",
        text : "locationLabel",
        textAlign : Ti.UI.TEXT_ALIGNMENT_CENTER
    });
 
    var finishedButton = Ti.UI.createButton({
        title : "Fertig",
        width : "100%",
        height : 50,
        bottom : 0,
        style : Titanium.UI.iPhone.SystemButtonStyle.BORDERED
    });
 
    modulPickerColumn = Ti.UI.createPickerColumn();
    var allModulRow = Ti.UI.createPickerRow({
        titel : "All Modules",
        value : 0
    });
 
    locationPickerColumn = Ti.UI.createPickerColumn();
    var allLocationsRow = Ti.UI.createPickerRow({
        titel : "All Locations",
        value : 0
    });

function loadLocations() {
        var locationURL = api.createURL(Alloy.CFG.apiURL, api.paths.locations);
        api.getContentFromURL(locationURL, api.urlInfoKey.locations, timeout, activityIndicatorView, function(objects) {
            if (objects != null && objects != 0) {
                for (var index in objects) {
                    var row = Ti.UI.createPickerRow({
                        titel : objects[index][keyBundle.keys.locationTitel],
                        value : objects[index][keyBundle.keys.locationID]
                    });
 
                    locationPickerColumn.addRow(row);
                }
 
                var picker = Ti.UI.createPicker({
                    columns : [modulPickerColumn, locationPickerColumn],
                    selectionIndicator : true
                });
                Ti.API.info(picker.columns[0].rows[0].titel);// the output is all Modules
                // the output is All Modules
                pickerView.add(picker);
                removeActivitIndicatorView(activityIndicatorView);
                isPickerCreated = true;
                animationPicker();
            }
        }, function(error, activityIndicatorView) {
            if (activitIndicatorView) {
                removeActivitIndicatorView(activityIndicatorView);
            }
            showHTTPClientErrorView(error);
        });
    }
 
    function loadModuls() {
        var modulURL = api.createURL(Alloy.CFG.apiURL, api.paths.moduls);
        api.getContentFromURL(modulURL, api.urlInfoKey.moduls, timeout, activityIndicatorView, function(objects) {
            if (objects != null && objects != 0) {
                for (var index in objects) {
                    var row = Ti.UI.createPickerRow({
                        titel : objects[index][keyBundle.keys.modulTitel],
                        value : objects[index][keyBundle.keys.modulID]
                    });
                    modulPickerColumn.addRow(row);
                }
                loadLocations();
            }
        }, function(error, activityIndicatorView) {
            if (activitIndicatorView) {
                removeActivitIndicatorView(activityIndicatorView);
            }
            showHTTPClientErrorView(error);
        });
    }
 
    loadModuls();