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java.io.IOException: Negative seek offset	at java.io.RandomAccessFile.seek(Native Method)	at org.apache.tools.zip.ZipFile.positionAtCentralDirectory(ZipFile.java:467)	at org.apache.tools.zip.ZipFile.populateFromCentralDirectory(ZipFile.java:313)	at org.apache.tools.zip.ZipFile.(ZipFile.java:185)	at org.apache.tools.ant.taskdefs.Expand.expandFile(Expand.java:170)	at org.apache.tools.ant.taskdefs.Expand.expandFile(Expand.java:192)	at org.apache.tools.ant.taskdefs.Expand.execute(Expand.java:132)	at hudson.ClassicPluginStrategy.explode(ClassicPluginStrategy.java:339)