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Jasper Report 7.0 - Cannot invoke "net.sf.jasperreports.engine.type.IncrementTypeEnum.equals(Object)"

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Jasper Report 7.0 when I try to edit a new variable I always raise this error on message box: An error has occurred. See error log for more details.
Cannot invoke "net.sf.jasperreports.engine.type.IncrementTypeEnum.equals(Object)" because the return value of "net.sf.jasperreports.engine.design.JRDesignVariable.getIncrementType()" is null

Attached you can find a screenshot. Any suggestions?


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