diff --git a/controllers/api_controller.go b/controllers/api_controller.go
index 26ae994cd..a909c74c1 100644
--- a/controllers/api_controller.go
+++ b/controllers/api_controller.go
@@ -150,7 +150,7 @@ func (c *ApiController) AddPrint(dataMap map[string]interface{}) (data string, e
 	return string(data2), err
 }
 
-func (c *ApiController) DoPrint(dataMap map[string]interface{}) (data string, err error) {
+func (c *ApiController) DoPrint(dataMap map[string]interface{}) (data string, err string) {
 	var (
 		content = dataMap["data"].(string)
 		printNo = dataMap["print_no"].(string)
@@ -159,7 +159,7 @@ func (c *ApiController) DoPrint(dataMap map[string]interface{}) (data string, er
 	)
 	globals.SugarLogger.Debugf("Begin API DoPrint data: [%v]", dataMap)
 	if orderNo == 0 {
-		return data, fmt.Errorf("订单序号不能为0")
+		return data, fmt.Sprintf("订单序号不能为0")
 	}
 	printMsg := &model.PrintMsg{
 		PrintNo: printNo,