代码如下：

                       fs.access({
                            path: `${wx.env.USER_DATA_PATH}/log`,  //寻找以log为名称的文件夹
                            success(res) {
                                // 文件存在
                                console.log(res)
                                fs.access({
                                    path: `${wx.env.USER_DATA_PATH}/log/` + newDate,  //寻找以日期为名称的文件夹
                                    success(res) {
                                        // 文件存在
                                        console.log(res)
                                        ////////////////////////////////////////
                                        fs.open({  //打开文件
                                            filePath: `${wx.env.USER_DATA_PATH}/log/` + newDate + '/log.txt',    //打开文件路径
                                            flag: 'a+', //追加写入文件，如果没有文件，则创建该文件
                                            success(res) {
                                                // 写入文件
                                                fs.write({
                                                    fd: res.fd,
                                                    data: writebuf,
                                                    success(res) {
                                                        console.log(res)
                                                        console.log("写入数据成功")
                                                    },
                                                    fail(res) {
                                                        console.error(res)
                                                        console.log("写入数据失败")
                                                    },
                                                    complete(res) {
                                                        fs.close({
                                                            fd: res.fd
                                                        })
                                                        console.log("要写入的数据为：" + writebuf)
                                                    }
                                                })
                                            }
                                        })
                                        ///////////////////////////////////////////
                                    },
                                    fail(res) {  //没有找到该文件夹，创建
                                        fs.mkdir({
                                            dirPath: `${wx.env.USER_DATA_PATH}/log/` + newDate,  //创建以日期为名称的文件夹
                                            success(res) {
                                                // 创建成功
                                                console.log(res)
                                            },
                                            fail(res) {
                                                console.error(res)
                                            }
                                        })
                                    }
                                })
                            },
                            fail(res) {  //没有找到该文件夹，创建
                                fs.mkdir({
                                    dirPath: `${wx.env.USER_DATA_PATH}/log`,  //创建以log为名称的文件夹
                                    success(res) {
                                        // 文件存在
                                        console.log(res)
                                    },
                                    fail(res) {
                                        console.error(res)
                                    }
                                })
                            }
                        })
                    }
                }

想创建一个/log/日期的文件夹，在这个文件夹下创建log.txt文件，每10s写一次数据，刚开始运行写数据正常，运行了一段时间后报错，报错内容如下：

麻烦问一下各位大佬，这个是哪里出错了？谢谢！