麻烦大佬看看，请问一下用walk包编写windows窗口为什么会出现这种错误啊。。。最基本的空窗口都无法运行

```go import ( "fmt" "github.com/lxn/walk" "github.com/lxn/walk/declarative" ) type Windows interface { ShowWindows()//展示窗体界面 } //创建解压缩的界面类 type ComWindow struct{ // 窗口 Windows *walk.MainWindow //主窗体 } type LabWindow struct{ // 信息显示 Windows } func Show(windows_type string){ var Win Windows switch windows_type { case "main_window": Win = new(ComWindow) case "lab_window": Win = &LabWindow{} default: fmt.Println("参数传递错误") } Win.ShowWindows()// 显示出来 } func (comWindow *ComWindow) ShowWindows(){ pathWindow := new(ComWindow) err:=declarative.MainWindow{ AssignTo:&pathWindow.MainWindow, //将ComWindow中的MainWindow的二级指针与declarative中的MainWindow相关联，关联主窗体 Title:"文件压缩", //窗口标题名称 MaxSize:declarative.Size{480,230}, //MaxSize是一个结构体类型 }.Create()//使用结构方法可以直接调用 if err!= nil{ fmt.Println(err) } //窗口的展示需要通过坐标来指定 pathWindow.SetX(650) pathWindow.SetY(300) pathWindow.Run() // 运行窗口，才能将创建的窗口展示出来 } func main(){ Show() } ``` 下面是报错 ``` Stack: goroutine 1 [running, locked to thread]: runtime/debug.Stack() D:/Go/src/runtime/debug/stack.go:24 +0x65 github.com/lxn/walk.newErr(...) C:/Users/Administrator/go/pkg/mod/github.com/lxn/walk@v0.0.0-20210112085537-c389da54e794/error.go:81 github.com/lxn/walk.newError({0x63c466, 0x12}) C:/Users/Administrator/go/pkg/mod/github.com/lxn/walk@v0.0.0-20210112085537-c389da54e794/error.go:85 +0x27 github.com/lxn/walk.(*ToolTip).addTool(0x40aedd, 0x6907a8, 0x80) C:/Users/Administrator/go/pkg/mod/github.com/lxn/walk@v0.0.0-20210112085537-c389da54e794/tooltip.go:184 +0xb6 github.com/lxn/walk.(*ToolTip).AddTool(0xc0000a0080, {0x6907a8, 0xc000047180}) C:/Users/Administrator/go/pkg/mod/github.com/lxn/walk@v0.0.0-20210112085537-c389da54e794/tooltip.go:160 +0x37 github.com/lxn/walk.(*WidgetBase).init(0xc000047180, {0xe47788, 0xc000047180}) C:/Users/Administrator/go/pkg/mod/github.com/lxn/walk@v0.0.0-20210112085537-c389da54e794/widget.go:137 +0xbe github.com/lxn/walk.initWindowWithCfg(0xc000074bd0) C:/Users/Administrator/go/pkg/mod/github.com/lxn/walk@v0.0.0-20210112085537-c389da54e794/window.go:670 +0x639 github.com/lxn/walk.InitWindow({0xe47788, 0xc000047180}, {0x68daf8, 0xc000009400}, {0x640f67, 0x6e}, 0x74c90, 0xc0) C:/Users/Administrator/go/pkg/mod/github.com/lxn/walk@v0.0.0-20210112085537-c389da54e794/window.go:538 +0xa5 github.com/lxn/walk.InitWidget({0x6907a8, 0xc000047180}, {0x68daf8, 0xc000009400}, {0x640f67, 0x1c}, 0x50000000, 0x0) C:/Users/Administrator/go/pkg/mod/github.com/lxn/walk@v0.0.0-20210112085537-c389da54e794/widget.go:110 +0xc5 github.com/lxn/walk.NewCompositeWithStyle({0x68daf8, 0xc000009400}, 0x0) C:/Users/Administrator/go/pkg/mod/github.com/lxn/walk@v0.0.0-20210112085537-c389da54e794/composite.go:30 +0xc5 github.com/lxn/walk.NewComposite({0x690198, 0xc000009400}) C:/Users/Administrator/go/pkg/mod/github.com/lxn/walk@v0.0.0-20210112085537-c389da54e794/composite.go:45 +0x37 github.com/lxn/walk.(*FormBase).init(0xc000009400, {0xe47400, 0xc000009400}) C:/Users/Administrator/go/pkg/mod/github.com/lxn/walk@v0.0.0-20210112085537-c389da54e794/form.go:107 +0x38 github.com/lxn/walk.initWindowWithCfg(0xc000074f50) C:/Users/Administrator/go/pkg/mod/github.com/lxn/walk@v0.0.0-20210112085537-c389da54e794/window.go:662 +0x5dd github.com/lxn/walk.NewMainWindowWithCfg(0xc000075040) C:/Users/Administrator/go/pkg/mod/github.com/lxn/walk@v0.0.0-20210112085537-c389da54e794/mainwindow.go:48 +0x12b github.com/lxn/walk/declarative.MainWindow.Create({{{0x0, 0x0}, {0x0, 0x0}, {0x0, 0x0}, {0x0, 0x0}, {0x0, 0x0}, ...}, ...}) C:/Users/Administrator/go/pkg/mod/github.com/lxn/walk@v0.0.0-20210112085537-c389da54e794/declarative/mainwindow.go:64 +0xfa main.(*ComWindow).ShowWindows(0xc00000e480) D:/Go/awesomeProject/src/windows.go:40 +0xac main.Show({0x63966f, 0xc00002c000}) D:/Go/awesomeProject/src/windows.go:30 +0xdf main.main() D:/Go/awesomeProject/src/main.go:6 +0x25 panic: runtime error: invalid memory address or nil pointer dereference [signal 0xc0000005 code=0x0 addr=0x0 pc=0x5b4b1f] goroutine 1 [running, locked to thread]: main.(*ComWindow).ShowWindows(0xc00000e480) D:/Go/awesomeProject/src/windows.go:45 +0xff main.Show({0x63966f, 0xc00002c000}) D:/Go/awesomeProject/src/windows.go:30 +0xdf main.main() D:/Go/awesomeProject/src/main.go:6 +0x25 Process finished with exit code 2 ```