用nodejs报TypeError: callback is not a function错误

我在项目中使用async的流程控制功能，想把task1查询到结果，传到task2中使用，但是却报了TypeError: callback is not a function，除此之外没有任何提示，我不知道是哪里处理问题，我是第一次接触nodejs，请各位大神帮忙看下是什么原因造成的这个错误，在此拜托了。 db.getTransaction(function(mssql,transaction){ //开启事务 transaction.begin(function(err){ if(err){ console.log(err); return; } //定义一个变量,如果自动回滚，则监听回滚时间并修改为true,无需手动回滚 var rolledBack = false; //监听回滚事件 transaction.on(‘rollback’,function(aborted){ console.log(‘listen rollback’); console.log(‘aborted值’+aborted); rolledBack = true; }); //监听提交事件 transaction.on(‘commit’,function(){ console.log(‘listen commit’); rolledBack = true; }); var request = new mssql.Request(transaction);

		async.auto({
			
		//查询T_ORD_ORDER的最新的ORD_ID字段
		task1:function(callback,result){
			request.query(sql3,function(err,result){
					if(err){
						console.log("task1 error:"+err);
						callback(err,null);
						return;
					}
					var ord_id = result[0].oid;
					console.log("company_id="+req.session.user[0].company_id);
					console.log("ord_id="+result[0].onum);
					ords_id = result[0].onum;
					console.log("ords_idaaaaaaaaaaaa:"+ords_id);
					console.log("task1result"+result);
					callback(null,result);
				})
			},
		//插入记录到T_ORD_CARGO表
		task2:['task1',function(callback,result){
			console.log("ords_id======================================"+ords_id);
			var sql2;
			   for(var i=1; i<crgbarcodearr.length;i++){
				 //sql2 = "insert into idealwl.dbo.T_ORD_CARGO(";
					sql2 = "insert into zhaobin.dbo.T_ORD_CARGO2(";
					if(crgbarcodearr[i]!=''){
						sql2 += "CRG_BARCODE,";
					}
					sql2 += "CRG_NAME,";
					
					if(crgkingdescarr[i]!=''){
						sql2 += "CRG_KIND_DESC,";
					}
					if(crgvolumearr[i]!=''){
						sql2 += "CRG_VOLUME,";
					}
					if(crgweightarr[i]!=''){
						sql2 += "CRG_WEIGHT,";
					}
					if(crgfeeganxianarr[i]!=''){
						sql2 += "CRG_FEE_GANXIAN,";
					}
					if(crgcountarr[i]!=''){
						sql2 += "CRG_COUNT,";
					}
					if(carmemosarr[i]!=''){
						sql2 += "MEMOS,";
					}
					sql2 += "ORD_ID";
					sql2+=") values('";
					if(crgbarcodearr[i]!=''){
						sql2+=crgbarcodearr[i]+"','";
					}
						sql2+=crgnamearr[i]+"','";
					
					if(crgkingdescarr[i]!=''){
						sql2+=crgkingdescarr[i]+"',";
					}
					if(crgvolumearr[i]!=''){
						sql2+=crgvolumearr[i]+",";
					}
					if(crgweightarr[i]!=''){
						sql2+=crgweightarr[i]+",";
					}
					if(crgfeeganxianarr[i]!=''){
						sql2+=crgfeeganxianarr[i]+",";
					}
					if(crgcountarr[i]!=''){
						sql2+=crgcountarr[i]+",'";
					}
					if(carmemosarr[i]!=''){
						sql2+=carmemosarr[i]+"',";
					}
					sql2 += ords_id+")";
					console.log("sql2:"+sql2);
				}
			   
			   request.query(sql2,function(err,result){
					if(err){
						console.log("task2 error:"+err);
						callback(err,null);
						return;
					}
					callback(null,result);---------------------------->   在这个地方报错
				})
		}],
		
		D:\workspace\YiXinCloudGuanjiaDemo\routes\user.js:543
					callback(null,result);
					^

TypeError: callback is not a function at D:\workspace\YiXinCloudGuanjiaDemo\routes\user.js:543:7 at D:\workspace\YiXinCloudGuanjiaDemo\node_modules\mssql\lib\main.js:1588:20 at Request.userCallback (D:\workspace\YiXinCloudGuanjiaDemo\node_modules\mssql\lib\tedious.js:853:61) at Request.callback (D:\workspace\YiXinCloudGuanjiaDemo\node_modules\tedious\lib\request.js:33:27) at Connection.message (D:\workspace\YiXinCloudGuanjiaDemo\node_modules\tedious\lib\connection.js:1179:27) at Connection.dispatchEvent (D:\workspace\YiXinCloudGuanjiaDemo\node_modules\tedious\lib\connection.js:519:45) at MessageIO.<anonymous> (D:\workspace\YiXinCloudGuanjiaDemo\node_modules\tedious\lib\connection.js:439:23) at emitNone (events.js:86:13) at MessageIO.emit (events.js:185:7) at ReadablePacketStream.<anonymous> (D:\workspace\YiXinCloudGuanjiaDemo\node_modules\tedious\lib\message-io.js:92:15)