Error reported by "useBaseUrl" during construction

[zhgtt]

🐛 Bug Report

Prerequisites

• I'm using the latest version of Docusaurus.
• I have tried the npm run clear or yarn clear command.
• I have tried rm -rf node_modules yarn.lock package-lock.json and re-installing packages.
• I have tried creating a repro with https://new.docusaurus.io
• I have read the console error message carefully (if applicable)

Description

• This error is always reported during construction
• used: yarn build

Have you read the Contributing Guidelines on issues?

(Write your answer here.)

Expected behavior

(Write what you thought would happen.)

Actual behavior

(Write what happened. Add full console log messages and screenshots, if applicable.)

Screen Shot

Your environment

• Docusaurus version used: latest
• Environment name and version (e.g. Chrome 78.0.3904.108, Node.js 10.17.0):
• Operating system and version (e.g. Ubuntu 20.04.2 LTS):

(Paste the link to an example repo, including a docusaurus.config.js, and exact instructions to reproduce the issue.)

[Josh-Cena]

Same reason as #5718. Also, you don't need useBaseUrl at all—src="/img/blog/2021-09-13/..." works just as well

[slorber]

For this specific use-case, you should rather use markdown: ![Example image](/img/blog/2021-09-13/xyz.png)

But @Josh-Cena is right, there's an issue with feeds that I didn't plan.

We'll track it there: #5664

[slorber]

Should be fixed in #5753, please try the latest canary after merge