GL ERROR : invalid value

Has anyone any clue on what this exception is refering to?? Could it be a known bug?? or am i not handling my threads well??

GL ERROR : invalid value
GL ERROR : 1281 x 0x501

java.lang.Exception

at gl4java.GLContext.gljCheckGL(GLContext.jave:2249)
at gl4java.awt.GLCanvas.display(GLCanvas.java:796)
at gl4java.awt.GLCanvas.sDisplay(GLCanvas.java:715)
at gl4java.awt.GLAnimCanvas.run(GLAnimCanvas.java:466)
at java.lang.Thread.run(Thread.java:466)