CommandException during cropping

[appu]

I am using ImageMagick-6.8.6-Q16 in Windows 7 platform for my application. I need to crop the input image to the specified size and process it. So writes the cropped image to the system temp folder (%Temp%). But intermittently IM failed to save the cropped images to the filesystem. Out of 20 runs, it happens 2 or 3 times. Following are the exception logs.

Used Im4Java-1.4.0v to interface my java application to underlying IM library.

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Caused by: org.im4java.core.CommandException: org.im4java.core.CommandException: convert.exe: WriteBlob Failed `-' @ error/png.c/MagickPNGErrorHandler/1804.
        at org.im4java.core.ImageCommand.run(ImageCommand.java:219)
        at com.my.IMagick.cropImage(MagickComparison.java:209)
        ... 11 more
Caused by: org.im4java.core.CommandException: convert.exe: WriteBlob Failed `-' @ error/png.c/MagickPNGErrorHandler/1804.
        at org.im4java.core.ImageCommand.finished(ImageCommand.java:253)
        at org.im4java.process.ProcessStarter.run(ProcessStarter.java:314)
        at org.im4java.core.ImageCommand.run(ImageCommand.java:215)
        ... 12 more

Images are saved in the PNG format. In Im4Java, IMOperation placeholders are defined as below

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IMOperation operation = new IMOperation();
operation.addImage();                                ---> for buffered input image
operation.crop(width, height, startX, startY);
operation.addImage("png:-");                      ---> output image place holder

Please help me to resolve this issue.

[fmw42]

It is possible that your tmp directory is periodically getting filled and so IM cannot write to the tmp directory. Make sure you tmp directory is large enough and purged regularly