上传图片，提示：上传资源文件失败

我上传图片，提示：上传资源文件失败
错误提示如下：

2018-09-05 08:57:49.438916+0800 *****[730:137194]  | JIGUANG | D - [JMSGConversation] Action - clearUnreadCount
2018-09-05 08:57:49.438 | JCHAT | D - [JCHATConversationViewController] Send response error - Error Domain=jmsg_error Code=860018 "七牛上传失败" UserInfo={NSLocalizedDescription=七牛上传失败}
2018-09-05 08:57:49.439319+0800  *****r[730:137193] 2018-09-05 08:57:49.438 | JCHAT | D - [JCHATConversationViewController] Send response error - Error Domain=jmsg_error Code=860018 "七牛上传失败" UserInfo={NSLocalizedDescription=七牛上传失败}
2018-09-05 08:57:49.443036+0800  *****r[730:137196]  | JIGUANG | D - [JMessage+JMSGInner] Action - sendRequest - TCP:66
2018-09-05 08:57:49.445 | JCHAT | D - [JCHATMessageTableViewCell] Action -- get thumbavatar fail
2018-09-05 08:57:49.446231+0800 *****[730:137536] 2018-09-05 08:57:49.445 | JCHAT | D - [JCHATMessageTableViewCell] Action -- get thumbavatar fail
2018-09-05 08:57:49.447032+0800  *****[730:137196] 2018-09-05 08:57:49.446 | JCHAT | D - [JCHATMessageTableViewCell] Action -- get thumbavatar fail
2018-09-05 08:57:49.446 | JCHAT | D - [JCHATMessageTableViewCell] Action -- get thumbavatar fail
2018-09-05 08:57:49.446 | JCHAT | D - [JCHATMessageTableViewCell] Action -- get thumbavatar fail
2018-09-05 08:57:49.448372+0800  *****[730:137194] 2018-09-05 08:57:49.446 | JCHAT | D - [JCHATMessageTableViewCell] Action -- get thumbavatar fail
2018-09-05 08:57:49.450117+0800  *****[730:137195]  | JIGUANG | D - [JIGUANGIMController] send im request with type:jmsg_type_update_unread_count,rid:4950
2018-09-05 08:57:49.450504+0800 *****[730:137195]  | JIGUANG | D - [JIGUANGSessionController] Action - doSendTcpRequest

这是什么问题？求解答。模拟器下运行的。