# 使用虚拟机时构建失败

如果您在Ubuntu或CentOS上使用虚拟机运行dfx，则当您尝试运行dfx build命令时，可能会看到一条错误消息，如下所示：

```
Building hello...
An error occurred:
Io(
 Os {
 code: 2,
 kind: NotFound,
 message: "No such file or directory",
 },
)
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://mixdao.gitbook.io/dfinity/san-shou-ba-shou/7.-gu-zhang-pai-chu/shi-yong-xu-ni-ji-shi-gou-jian-shi-bai.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.