Could not initialize class org.owasp.validator.html.scan.AntiSamySAXScanner

Hi 

I've just installed the AEM 6.2 QuickStart (author mode) on my mac and and got the following errors when try to click view more info of the sample projects such as Geometric Outdoors.  

Could not initialize class org.owasp.validator.html.scan.AntiSamySAXScanner

Cannot serve request to /mnt/overlay/cq/core/content/projects/properties.html in /libs/cq/gui/components/projects/admin/simpletable/simpletable.jsp

Exception:

java.lang.NoClassDefFoundError: Could not initialize class org.owasp.validator.html.scan.AntiSamySAXScanner

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Please see the full error in attachment. 

Anyone familiar with this error and know how to solve it.