Icy Version 1.6.1.1
Java(TM) SE Runtime Environment 1.7.0_21-b14 (32 bit)
Running on Windows XP 5.1 (x86)
Max java memory : 958.9 MB

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Not enough memory !
Try to increase the Maximum Memory parameter in Preferences.
You can also report the error if you think it is not due to a memory problem.
java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.addWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.processWorkerExit(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)