Qt Installer Framework errors

Perdrix

>C:\Qt\QtIFW-4.5.0\bin\binarycreator.exe -c config\config.xml -p packages DSS-5.1.0-Setup.exe
[4] Warning: QFile::remove: Empty or null file name
Caught exception: Component package description in "C:\Users\amonra\Documents\GitHub\DSS\Installers\packages\DeepSkyStacker\meta\package.xml" is invalid. Error at line: 1, column: 7 -> invalid name for processing instruction

Here's the package file:

<?xml version="1.0" encoding="UTF-8"?>
<Package>
    <DisplayName>DeepSkyStacker</DisplayName>
    <Description>Stacking software for Astronomical Images.</Description>
    <Version>5.1.0 Beta 1</Version>
    <ReleaseDate>2022-12-01</ReleaseDate>
    <Licenses>
        <License name="BSD 3-Clause License" file="LICENSE" />
    </Licenses>
    <Default>script</Default>
    <Script>installscript.qs</Script>
    <UserInterfaces>
        <UserInterface>page.ui</UserInterface>
    </UserInterfaces>
</Package>

What is wrong please?
Thanks
David