The follow problem can be replicated with the Nokia series 60 SDK.

Write a simple midp program that loads a resource (e.g. a png image) from a
folder, say /res/. This program will run fine with the default emulator.

Now, add the nokia series 60 emulator using (Tools)->(Java Plaform Manager)
Compiling the program works fine.
Executed the compiled program using the nokia emulator will cause errors since
the image cannot be loaded. You get null pointer exceptions when you try to use
the image.

The loading of the image is usually done using relative path like this:
Image img = Image.createImage("/res/testing.png", 0, 0, 0);

This works for the default emulator but not the newly added emulator in the
nokia series 60 SDK. This problem also occurs for a few other SDKs from
different vendors.