必须声明标识符 'VARCHER2'怎么修改

create or replace function ch_height_pm(in_cid in number, in_name in varcher2) return number is

  pm number;
  ch_height number;
begin
  select c.height into ch_height from children c 
         where c.cid=in_cid and in_name=c.name;
  select count(1) into pm from children c
         where c.cid=in_cid and in_name=c.name and c.height>ch_height;
  pm:=pm+1;
  
  return(pm);
  exception
    when no_data_found  then
     dbms_output.put_line('该学生的身高：'||p_in_courseid|| '的学生表中找不到');
end ch_height_pm;

FUNCTION SYS.CH_HEIGHT_PM 编译错误

错误：PLS-00201: 必须声明标识符 'VARCHER2'
行：1
文本：create or replace function ch_height_pm(in_cid in number, in_name in varcher2) return number is

错误：PL/SQL: Compilation unit analysis terminated
行：1
文本：create or replace function ch_height_pm(in_cid in number, in_name in varcher2) return number is

VARCHAR2
单词拼错了