Pinta throws an error when I open it from Eclipse

Open Pinta first, then click file, and open.   Navigate to your codakid folder, then inside projects, then the project name, then src, then main, then resources, then assets, then foundations, then textures, then items. There you will see your mySword.png. Open that, and it should open correctly. You can also use the same technique to open any other texture.

Desktop\CodaKid\projects\WORKSPACE\src\main\resources\assets\foundations\textures\items