The JScript compiler does not recognize an identifier. This may occur when a referenced variable does not exist or when a with block is used to access an object property that does not exist.
To correct this error
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Declare the variable with a var statement (as in var x;).
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Make sure that only valid object members are referenced in a with block.
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Reference the object member explicitly instead of using the with statement.
See Also
Reference
var Statementwith Statement
Concepts
Scope of Variables and ConstantsOther Resources
JScript Variables and ConstantsJScript Reference