It was working with previous version but I can't open it now. I got this error, I don't know if someone could help me. Thanks in advance

SPOILER
Tue Sep 01 21:23:06 CLT 2015 ERROR:Pixel format not accelerated
org.lwjgl.LWJGLException: Pixel format not accelerated
at org.lwjgl.opengl.WindowsPeerInfo.nChoosePixelFormat(Native Method)
at org.lwjgl.opengl.WindowsPeerInfo.choosePixelFormat(WindowsPeerInfo.java:52)
at org.lwjgl.opengl.WindowsDisplay.createWindow(WindowsDisplay.java:247)
at org.lwjgl.opengl.Display.createWindow(Display.java:306)
at org.lwjgl.opengl.Display.create(Display.java:848)
at org.lwjgl.opengl.Display.create(Display.java:757)
at org.newdawn.slick.AppGameContainer.tryCreateDisplay(AppGameContainer.java:302)
at org.newdawn.slick.AppGameContainer.access$000(AppGameContainer.java:34)
at org.newdawn.slick.AppGameContainer$2.run(AppGameContainer.java:367)
at java.security.AccessController.doPrivileged(Native Method)
at org.newdawn.slick.AppGameContainer.setup(AppGameContainer.java:348)
at itdelatrisu.opsu.Container.start(Container.java:69)
at itdelatrisu.opsu.Opsu.main(Opsu.java:205)
Tue Sep 01 21:23:06 CLT 2015 ERROR:** Uncaught Exception! **
Tue Sep 01 21:23:06 CLT 2015 ERROR:null
java.lang.NullPointerException
at itdelatrisu.opsu.GameImage.setDefaultImage(GameImage.java:615)
at itdelatrisu.opsu.GameImage.getImage(GameImage.java:553)
at itdelatrisu.opsu.ui.Cursor.reset(Cursor.java:290)
at itdelatrisu.opsu.Container.close_sub(Container.java:121)
at itdelatrisu.opsu.Container.start(Container.java:75)
at itdelatrisu.opsu.Opsu.main(Opsu.java:205)