applet - What does this exception mean? and how do i solve this? java -

I am using the IcePDF component to view PDFs in my webpage in Gmail. But for some reason I get this error, can anyone tell why is happening and how to solve it?

  thread "exception java.lang.StackOverflowError thread Aplet- applet.KitKitApplet.class -1" java.util.PropertyPermissionCollection. Means SunksecuritykproviderkPolicyFilekimplies (Unknown Source java.security.ProtectionDomain.implies on JavaksecuritykAccessControlContext) ((Unknown Source java.security.Permissions.implies unknown source)) (unknown source). On CheckPermission (Unknown Source) JavaksecuritykAccessControllerkcheckPermission (Unknown Source java.lang.SecurityManager.checkPermission on JavaklangkSecurityManagerkcheckPropertyAccess (Unknown Source) at JavaklangkSystemkgetProperty) (unknown source) ( unknown source org.icepdf.core.util.Defs.property (Defs.java:59 on org.icepdf.core.util.Defs.property) (Defs.java:63)) on org.icepdf.core.util. Defs.property on org.icepdf.core.util.Defs.property (Defs.java:63) on Org.icepdf.core.u (Defs.java:63) til.Defs.property org.icepdf.core.util. Defs.property (Defs.java:63) on org.icepdf.core.util.Defs.property (Defs.java:63) (Defs.java:63)  

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It seems that you have attended the program to read a system property that the applet sandbox will not allow it to read Trying, and the upcoming SecurityException is not properly controlled by the IcePDF.