TypeError: Path must be a string. Received undefined

TypeError: Path must be a string. Received undefined
TypeError: Path must be a string. Received undefined
    at assertPath (path.js:7:11)
    at Object.normalize (path.js:311:5)
    at normalize (C:\Users\AllenIverson\.gitbook\versions\3.2.2\lib\utils\location.js:39:17)
    at Object.toAbsolute (C:\Users\AllenIverson\.gitbook\versions\3.2.2\lib\utils\location.js:72:13)
    at C:\Users\AllenIverson\.gitbook\versions\3.2.2\lib\output\modifiers\resolveImages.js:24:29
    at C:\Users\AllenIverson\.gitbook\versions\3.2.2\lib\output\modifiers\editHTMLElement.js:11:16
    at C:\Users\AllenIverson\.gitbook\versions\3.2.2\lib\utils\promise.js:36:16
    at C:\Users\AllenIverson\.gitbook\versions\3.2.2\lib\utils\promise.js:22:20
    at _fulfilled (C:\Users\AllenIverson\.gitbook\versions\3.2.2\node_modules\q\q.js:834:54)
    at self.promiseDispatch.done (C:\Users\AllenIverson\.gitbook\versions\3.2.2\node_modules\q\q.js:863:30)

不是真的路径有错误，而是该文件里面的内容有无法识别，转换为html格式文件。文件里面的HTML标签一定要放在代码块里面

出错的地方：在表单中给出指向VerifyCodeServlet，用来在页面中显示验证码图片
改为：在表单中给出<img>指向VerifyCodeServlet，用来在页面中显示验证码图片
即将<改为<