Thread: [508] Client error help.

This happens whenever i go to the air alter coords....

Code:

Exception in thread "Thread-4" java.lang.OutOfMemoryError: Java heap space
        at RSString.method1612(RSString.java:856)
        at Class21.method336(Class21.java:188)
        at Class21.method350(Class21.java:520)
        at Class61.method598(Class61.java:337)
        at client.method33(client.java:765)
        at Applet_Sub1.method30(Applet_Sub1.java:485)
        at Applet_Sub1.run(Applet_Sub1.java:156)
        at java.lang.Thread.run(Unknown Source)

and it doesnt print out any missing mapdata in my server...
i hate working with client stuff so any help is gr8! Thanks.