Error: from config: failed to resolve output format "headers" from site config

[ngoccuongnguyen]

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Describe the bug

After the recent update for the repo github.com/wowchemy/wowchemy-hugo-themes, the command hugo server produces "Error: from config: failed to resolve output format "headers" from site config".

To Reproduce

Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. See error '...'

Expected behavior

A clear and concise description of what you expected to happen.

Technical details:

• Link to your GitHub project:
• Wowchemy Version (from your go.mod):
• Hugo Version (run hugo version):
• Browser/OS:
• Wowchemy Template (e.g. Academic):

If applicable, add screenshots to help explain the issue.

[cbrueffer]

This needs a lot more information to be useful, your own issue actually states the minimal information required.

Generally this problem is described in the Troubleshooting Guide: https://wowchemy.com/docs/hugo-tutorials/troubleshooting/#error-failed-to-resolve-output-format

However, I encountered this problem while updating from v5.5.0 to v5.6.0, and the solution in the guide (removing the hugo cache) wasn't sufficient.

What made it work for me (probably in addition to the above) was adding all three modules (wowchemy-plugin-netlify-cms, wowchemy-plugin-netlify, wowchemy/v5) in config.yaml and go.mod instead of just wowchemy/v5; I had omitted the other two since I don't use Netlify. See https://github.com/wowchemy/wowchemy-hugo-themes/blob/main/starters/academic/go.mod and https://github.com/wowchemy/wowchemy-hugo-themes/blob/main/starters/academic/config/_default/config.yaml