NullPointerException when doing findAll

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Stacktrace:

java.lang.NullPointerException
at java.awt.image.ColorConvertOp.filter(Unknown Source)
at 
org.sikuli.core.cv.ImagePreprocessor.createGrayscale(ImagePreprocessor.java:51)
at 
org.sikuli.core.search.algorithm.TemplateMatcher.findMatchesByGrayscaleAtOrigina
lResolution(TemplateMatcher.java:18)
at org.sikuli.api.ImageTarget.getUnordredMatches(ImageTarget.java:122)
at org.sikuli.api.DefaultTarget.doFindAll(DefaultTarget.java:93)
at org.sikuli.api.MultiStateTarget.getUnordredMatches(MultiStateTarget.java:27)
at org.sikuli.api.DefaultTarget.doFindAll(DefaultTarget.java:93)
at org.sikuli.api.DefaultScreenRegion.findAll(DefaultScreenRegion.java:58)
...
ScreenRegion region = ...;
region.findAll(new ImageTarget(ImageIO.read(new File("img.png"))));

What is this, why is this?

Original issue reported on code.google.com by miglecz on 17 Jan 2013 at 9:38

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[deleted comment]

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Image attached. Made with mspaint.

Original comment by miglecz on 17 Jan 2013 at 9:44

Attachments:

• img.png

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can you try other images? do you experience the same problem? Or only with this 
lockedtargetbottom image?

Original comment by doubles...@gmail.com on 17 Jan 2013 at 9:44

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Original comment by doubles...@gmail.com on 26 Feb 2013 at 7:43

• Changed state: WontFix