Thanks. You didn't include the png file, but my first impression is that the loader doesn't like the path to the png file in the tsx file. As a work around try putting the png file in the same folder as the tsx and edit the tsx file so
<image source="../Projects/Minecraft.png" width="256" height="256"/>
becomes
<image source="Minecraft.png" width="256" height="256"/>
oh and the tsx / png should be in the same dir as the tmx file, which will need
<tileset firstgid="1" source="../../../../Tiled/Minecraft.tsx"/>
changing to
<tileset firstgid="1" source="Minecraft.tsx"/>