Internal error...why?

Good evening,
when I try to change the color of any component the browser gives me an error. how can i solve?

immagine

faultData = com.google.gwt.event.shared.UmbrellaException: Exception caught: (SyntaxError) : JSON.parse: expected property name or ‘}’ at line 1 column 3 of the JSON data

i’m so sorry

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I had exactly the same issue. After applying your solution it works perfect!
Thank you so much for posting it!

Best regards

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