Error setting property on XXX!

Language	Message
英文	Error setting property on NPObject!
	Uncaught Error: Error calling method on NPObject.

出没于 Firefox 之中，常见于属性值不合法时。目前已知的起因是由 Flash/Object(Flash) 控件引起，搜索出来的结果大都与 ActionScript 3 相关。

案例

异常字段	值
Message	Uncaught Error: Error calling method on NPObject.
URI	http://www.example.com/index.htm
File	http://www.example.com/index.htm
Line	225

if(obj.prizeType == 5){
  prizeSendId = obj.prizeSendId;
  prodCode = obj.mktPrizeParamList[0].paramName;
  $("J-flash").node.showBox(prodCode);
}else{
  prizeName = obj.prizeName;
  $("J-flash").node.showPrize(prizeName);
}

异常字段	值
Message	Error setting property on scriptable plugin object!
URL	https://www.example.com/index.htm
File	https://www.example.com/index.htm
Line	0

异常字段	值
Message	Error setting property on NPObject!

参考

NPObject Error Using Firefox, Flash, and Javascript
Error calling method on NPObject!
(RESOLVED) NPObject?
SL2: Error setting property on scriptable plugin object!
Javascript calling C# function under Silverlight
Error setting property with latest plugin - progresswrite?
Firefox: Error enumerating properties on scriptable plugin object No Graph rendered.

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