java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at java.io.Reader.(Reader.java:78)
at java.io.InputStreamReader.(InputStreamReader.java:72)
at jsettlers.graphics.map.draw.settlerimages.SettlerImageMap.readFromFile(SettlerImageMap.java:98)
at jsettlers.graphics.map.draw.settlerimages.SettlerImageMap.readFromFile(SettlerImageMap.java:94)
at jsettlers.graphics.map.draw.settlerimages.SettlerImageMap.(SettlerImageMap.java:75)
at jsettlers.graphics.map.draw.settlerimages.SettlerImageMap.getInstance(SettlerImageMap.java:361)
at jsettlers.graphics.map.draw.ImagePreloadTask.run(ImagePreloadTask.java:22)
at java.lang.Thread.run(Thread.java:745)

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