SQLSTATE [HY093]：参数号错误无效

Question

您好我的代码有问题，我已经多次检查过，但似乎无法找到它。我正在使用HTML，JS，Slim框架和PHP，并从mysql获取数据。 任何帮助将不胜感激！

JS

$(document).ready(function(){
    $("#edit").click(function(){
    var coach=new Coach(
                        $("#CoachFirstName").val(),
                        $("#CoachLastName").val(),
                        $("#CoachExperienceYrs").val(),
                        $("#CoachPastTeam").val());



    $.ajax({
     type:'PUT',
     dataType:"json",
     url:"db.php/coachs/1",
     data:JSON.stringify(coach),
     success: showResponse,
     error: showError
        });    
    }); });

function Coach(CoachFirstName, CoachLastName, CoachExperienceYrs, CoachPastTeam){

        this.CoachFirstName=CoachFirstName; 
        this.CoachLastName=CoachLastName; 
        this.CoachExperienceYrs=CoachExperienceYrs;
        this.CoachPastTeam=CoachPastTeam; 
    }   function showResponse(responseData) { 
        console.log(responseData);      } 

            function showError() {          
         alert("Error while updating" );
         };

PHP - SLIM

 $app->put('/coachs/:id', 'updateCoach');


    function updateCoach($id){
    $request = Slim::getInstance()->request();
    $coach = json_decode($request->getBody());
    $sql = "UPDATE coach SET CoachFirstName=:CoachFirstName, CoachLastName=:CoachLastName, CoachExperienceYrs=:CoachExperienceYrs, CoachPastTeam=:CoachPastTeam WHERE CoachID=:id";
    try {
    $db = getConnection();
    $stmt = $db->prepare($sql);
    $stmt->bindParam("CoachFirstName",$coach->CoachFirstName);
    $stmt->bindParam("CoachLastName",$coach->CoachLastName);
    $stmt->bindParam("CoachExperienceYrs",$coach->CoachExperienceYrs);
    $stmt->bindParam("CoachPastTeam",$coach->CoachPastTeam);
    $stmt->bindParam("id",$id); 
    $stmt->execute();
    $coach = $stmt->fetchObject();
    $db = null;
    responseJson(json_encode($coach),200);
}catch(PDOException $e){
    responseJson('{"error":{"text":'.$e->getMessage().'}}', 500);
}

    }