scheme unbound identifier error in module in: symbol <? -

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The following line in my code is giving me an unbound identifier error. 

  ((Anybody please explain to me why I got this error and how can I fix this?)  
 Here the whole code:  
 ; defined in the sorted list of symbols (define (member? Xl) (code (empty? L) #f) ((symbol =? X (car l)) # t () (symbol And lt; x (car l)) #f (other (member? X (cdr l)))

is not a symbol , but there is a string De> - So if we change the symbol in a string (symbol-> S1S2) (string & lt;? (Symbol-> string s1) (symbol-> string s2) ) 

  will be able to define

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