You attempted to invoke the Boolean.prototype.toString or Boolean.prototype.valueOf method on an object of a type other than Boolean. The object of this type of invocation must be of type Boolean. For example:

	Copy Code
var o = new Object; o.f = Boolean.prototype.toString; o.f();

To correct this error

Only invoke the Boolean.prototype.toString or Boolean.prototype.valueOf methods on objects of type Boolean.

To correct this error

See Also

Reference

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