303 error when packaging Air Applications: Missing icons

I am getting an 303 error when I package my project. It says that missing 3 of my icons (36.png, 144.png, 50.png): ".... is missing from package."

However, I have those images in my icons folder and I checked the xml file as well.

Error message:

Icons from xml file:

  <icon>
  <image29x29>assets/icons/29.png</image29x29>
  <image36x36>assets/icons/36.png</image36x36>
  <image40x40>assets/icons/40.png</image40x40>
  <image48x48>assets/icons/48.png</image48x48>
  <image50x50>assets/icons/50.png</image50x50>
  <image57x57>assets/icons/57.png</image57x57>
  <image58x58>assets/icons/58.png</image58x58>
  <image60x60>assets/icons/60.png</image60x60>
  <image72x72>assets/icons/72.png</image72x72>
  <image76x76>assets/icons/76.png</image76x76>
  <image80x80>assets/icons/80.png</image80x80>
  <image100x100>assets/icons/100.png</image100x100>
  <image114x114>assets/icons/114.png</image114x114>
  <image120x120>assets/icons/120.png</image120x120>
  <image144x144>assets/icons/144.png</image144x144>
  <image152x152>assets/icons/152.png</image152x152>
  <image512x512>assets/icons/512.png</image512x512>
   <image1024x1024>assets/icons/1024.png</image1024x1024>
</icon>

Screen shot of icons in folder:

Anyone have any solutions?