有一个字符型变量，要把它变为数值型变量，样本容量有40万，提示如下错误：
[P]     error . . . . . . . . . . . . . . . . . . . . . . . .  Return code 134
        too many values;
        (1) You attempted to encode a string variable that takes on more
        than 65,536 unique values.  (2) You attempted to tabulate a variable
        or pair of variables that take on too many values.  If you
        specified two variables, try interchanging the two variables.
        (3) You issued a graph command using the by option.  The by-variable
        takes on too many different values to construct a readable chart.

应该是违背了第一条
请问这种情况该如何处理？
谢谢！