uniapp离线打包后，openDocument报错

hbulider调试有效,离线打包报错
代码：

downloadFile(info){  
                uni.downloadFile({  
                    url: this.constApis.LAWSDOWNLOAD.URL+"?id="+info+"&tableName=2",  
                    success: function (res) {  
                        var filePath = res.tempFilePath;  
                        uni.saveFile({  
                          tempFilePath: filePath,  
                          success: function (res) {  
                            var savedFilePath = res.savedFilePath;  
                            console.log("保存文件路径:="+savedFilePath);  
                            uni.openDocument({  
                                filePath: savedFilePath,  
                                success: function (res) {  
                                    uni.showToast({  
                                        icon: 'none',  
                                        duration: 1000,  
                                        title: "chenggong=="+JSON.stringify(res)  
                                    });  
                                    console.log('打开文档成功');  
                                },  
                                fail:function (res) {  
                                    uni.showToast({  
                                        icon: 'none',  
                                        duration: 1000,  
                                        title: "shiba==="+JSON.stringify(res)  
                                    });  
                                }  
                            });  
                          }  
                        });  
                    },  
                    fail:function (res) {  
                    }  
                });  
            }

android调试报错