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JasperStudio error: java.lang.NullPointerException at java.lang.Class.isAssignableFrom(Native Method)


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Just installed Jasper Studio last version 6.6 on Mac with java 1.8.

I get java.lang.NullPointerException at java.lang.Class.isAssignableFrom(Native Method) when I try to access a dashboard downloaded from server.

I checked the project, I don't understand which jar is not right...

I have

- JRE System Library from jdk1.8.0_91

- JasperReports Library from 6.6.0 installed on my mac

- Jaspersoft Server Library: js-extra-classes.jar


Don't know what else to do



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