Displaying Blank page in which PDF link is included

Android OS version 7.1.1, following code display blank screen first time after download the App. Have to kill the App and open it again to work normally. Please advise.

Code:

Container cc = new Container(BoxLayout.y());
cc.setScrollableY(true);
TextArea ta = new TextArea(Util.readToString(is));
ta.setEditable(false);
ta.setUIID("Label");
Button b = new Button("Terms of Service");
b.addActionListener(e3 -> {
try {
FileSystemStorage fs = FileSystemStorage.getInstance();
final String homePath = fs.getAppHomePath();
String fileName = homePath + "Terms of Service.pdf";
Util.copy(Display.getInstance().getResourceAsStream(getClass(), "/Terms of Service.pdf"), fs.openOutputStream(fileName));
Display.getInstance().execute(fileName);
} catch (IOException ex) {
}
});
cc.add(ta);
CheckBox rememberMe1 = new CheckBox();
rememberMe1.setSelected(false);
rememberMe1.setHeight(Display.getInstance().convertToPixels(10.0f));
rememberMe1.setAutoSizeMode(true);
b.setAutoSizeMode(true);
setSameHeight(rememberMe1, l11, b);
cc.add(FlowLayout.encloseIn(rememberMe1, b));


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