Item is not valid as the left-hand side of an EVAL operation.
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Cause . . . . . : The left-hand side of an EVAL operation must be an item that can be modified. This means that the following cannot be on the left-hand side since they cannot be modified: figurative constants; literals; named constants; lookahead fields; entry parameters with the CONST keyword specified; prototype names; certain special words and built-in functions. The specification is ignored.
Recovery . . . : Specify a variable in the left-hand side of the EVAL operation or remove the specification. Compile again.
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