如何捕获错误信息

[dxxjing]

userId := "123"
	botId = strings.TrimSpace(botId)
	autoSaveHistory := false
	stream := true
	chatReq := coze.CreateChatsReq{
		ConversationID: "",
		BotID:          botId,
		UserID:         userId,
		Messages: []*coze.Message{
			coze.BuildUserQuestionText(prompt, nil),
		},
		Stream:          &stream,
		CustomVariables: nil,
		AutoSaveHistory: &autoSaveHistory,
		MetaData:        nil,
	}
var result string
resp, err := uc.components.ChineseCoze.Chat.Stream(ctx, &chatReq)
if err != nil {
		return "", err
	}
defer resp.Close()
	var tokenCount int
	for {
		event, err := resp.Recv()
		if errors.Is(err, io.EOF) { // finished
			break
		}
		if err != nil { 
			return "", err
		}
		if event.Event == coze.ChatEventConversationChatCompleted {
			tokenCount = event.Chat.Usage.TokenCount
		} else if event.Event == coze.ChatEventConversationMessageCompleted {
			if event.Message.Type == coze.MessageTypeAnswer {
				result = event.Message.Content
			}
		}
	}
fmt.Println(result)

最后打印result 如下：
[702112104] System Internal Error:Our system encountered an unexpected internal error. This is usually a temporary issue and should be resolved quickly.Please:Wait for a moment and try your operation again.If the problem persists, try refreshing the page or logging in again.Our technical team has received an alert and is actively working on resolving the issue.We apologize for any inconvenience. If the issue continues, please contact customer support.

判断err 仍然捕获不到这个错误信息，请问这个错误如何正常处理？