为什么在创建deveco的项目之后，previewer不显示helloword？

1. 
2. 报错显示：

Error: Signing material error at HvigorLogger.errorMessageExit (D:\yidongzhongduan\DevEco Studio\tools\hvigor\hvigor\src\base\log\hvigor-log.js:1:3224) at SessionIdHelper.readDirBytes (D:\yidongzhongduan\DevEco Studio\tools\hvigor\hvigor\src\base\daemon\session\session-id.js:1:5365) at D:\yidongzhongduan\DevEco Studio\tools\hvigor\hvigor\src\base\daemon\session\session-id.js:1:4934 at Array.forEach (<anonymous>) at SessionIdHelper.readFd (D:\yidongzhongduan\DevEco Studio\tools\hvigor\hvigor\src\base\daemon\session\session-id.js:1:4899) at SessionIdHelper.getKey (D:\yidongzhongduan\DevEco Studio\tools\hvigor\hvigor\src\base\daemon\session\session-id.js:1:3613) at Object.<anonymous> (D:\yidongzhongduan\DevEco Studio\tools\hvigor\hvigor\src\base\daemon\session\session-id.js:1:7439) at Module._compile (node:internal/modules/cjs/loader:1364:14) at Module._extensions..js (node:internal/modules/cjs/loader:1422:10) at Module.load (node:internal/modules/cjs/loader:1203:32)

Node.js v18.20.1

Process finished with exit code -1

3、IDE:

DevEco Studio 5.0.3 Beta2 Build #DS-233.14475.28.36.509200 Build Version: 5.0.9.200, built on March 6, 2025 Runtime version: 17.0.12+1-b1087.25 amd64 VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o. Windows 11.0 GC: G1 Young Generation, G1 Old Generation Memory: 2048M Cores: 16 Registry: idea.plugins.compatible.build=IC-233.14475.2

4、

提问题尽量把报错信息发完整，编译环境、IDE版本说清楚。

你这个大概率是本地环境配置有问题。

新建的工程需要稍微改造下，可参考我的pr
https://gitee.com/wanfan_yyds/de ... c770b89fd8cc3b3f368

改造完，再在index.ets启动预览即可。