When I tried to select an enzymes in the Restriction sites tab and clicked on Map sites button the following exception is thrown in the console

Exception in thread "pool-13-thread-2" java.lang.OutOfMemoryError: Java heap space
at java.nio.HeapByteBuffer.<init>(HeapByteBuffer.java:39)
at java.nio.ByteBuffer.allocate(ByteBuffer.java:312)
at com.affymetrix.genometryImpl.util.TwoBitIterator.parse(TwoBitIterator.java:196)
at com.affymetrix.genometryImpl.util.TwoBitIterator.substring(TwoBitIterator.java:176)
at com.affymetrix.genometryImpl.symloader.TwoBit.getRegionResidues(TwoBit.java:88)
at com.affymetrix.igb.general.ResidueLoading.GetQuickLoadResidues(ResidueLoading.java:219)
at com.affymetrix.igb.general.ResidueLoading.getQuickLoadResidues(ResidueLoading.java:171)
at com.affymetrix.igb.general.ResidueLoading.getResidues(ResidueLoading.java:86)
at com.affymetrix.igb.view.load.GeneralLoadUtils.loadResidues(GeneralLoadUtils.java:992)
at com.affymetrix.igb.view.load.GeneralLoadView.loadResidues(GeneralLoadView.java:230)
at com.affymetrix.igb.view.load.GeneralLoadView.loadResidues(GeneralLoadView.java:223)
at com.affymetrix.igb.action.LoadResidueAction.actionPerformed(LoadResidueAction.java:75)
at com.affymetrix.igb.restrictions.RestrictionControlView$GlyphifyMatchesThread.run(RestrictionControlView.java:261)
at java.lang.Thread.run(Thread.java:680)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)