Error: (string-length) bad argument type: ("" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "")

        Call history:

        parley.scm:149: get-output-string         
        parley.scm:400: display   
        parley.scm:401: display   
        parley.scm:403: string-fold       
        parley.scm:403: display   
        parley.scm:410: esc-seq   
        parley.scm:156: alist-ref         
        parley.scm:410: g589      
        parley.scm:410: display   
        parley.scm:411: esc-seq   
        parley.scm:156: alist-ref         
        parley.scm:411: g591      
        parley.scm:411: display   
        parley.scm:412: esc-seq   
        parley.scm:156: alist-ref         
        parley.scm:412: g593      
        parley.scm:149: open-output-string        
        parley.scm:149: display   
        parley.scm:149: display   
        write-char/port   
        parley.scm:149: get-output-string         
        parley.scm:412: display   
        parley.scm:416: flush-output      
        parley.scm:385: current-output-port574575         
        parley.scm:421: read-one-char     
        parley.scm:104: first-usable-port         
        parley.scm:97: port-closed?       
        parley.scm:88: call-with-current-continuation     
        parley.scm:90: with-exception-handler     
        parley.scm:93: port?      
        parley.scm:93: port->fileno       
        parley.scm:91: k          
        parley.scm:101: first-usable-port         
        parley.scm:97: port-closed?       
        parley.scm:88: call-with-current-continuation     
        parley.scm:90: with-exception-handler     
        parley.scm:93: port?      
        parley.scm:93: port->fileno       
        parley.scm:105: char-ready?       
        read-char/port    
        parley.scm:422: alist-ref         
        parley.scm:426: newline   
        parley.scm:427: return    
        parley.scm:506: loop      
        parley.scm:504: peek-char         
        parley.scm:505: reverse   
        parley.scm:517: restore-terminal-settings         
        parley.scm:123: stty#set-terminal-attributes!     
        stty.scm:206: port?       
        stty.scm:206: port->fileno              <--