Uncaught error fetching image: java.lang.NullPointerException

everytime I try to run my client in Eclipse, I get this:

Code:

Uncaught error fetching image:
java.lang.NullPointerException
	at sun.awt.image.URLImageSource.getConnection(Unknown Source)
	at sun.awt.image.URLImageSource.getDecoder(Unknown Source)
	at sun.awt.image.InputStreamImageSource.doFetch(Unknown Source)
	at sun.awt.image.ImageFetcher.fetchloop(Unknown Source)
	at sun.awt.image.ImageFetcher.run(Unknown Source)

What I have tried:

- Switching compiler version to Java 6, 7, and 8. (Currently running on 7 as it should be)
- Restarting Eclipse
- Restarting server