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The code invoked the Enumerator.prototype.atEnd, Enumerator.prototype.item, Enumerator.prototype.moveFirst, or Enumerator.prototype.moveNext method on an object of a type other than Enumerator. The object of this type of invocation must be of type Enumerator.
To correct this error
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Only invoke the Enumerator.prototype.atEnd, Enumerator.prototype.item, Enumerator.prototype.moveFirst, or Enumerator.prototype.moveNext methods on objects of type Enumerator. To find out if your object is an Enumerator object, use:
В 
Copy Codeif(x instanceof Enumerator)
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