failed to open stream: No such file or directory for static-content deploy

Question

I have recently added a new root source css file for magento storefront by putting it in default_head_blocks.xml throught below statement.

<css src="css/custom.css"/>

Now I ran upgrade command

php bin/magento setup:upgrade

I am having the same custom.less file at below path of my custom theme.

app/design/frontend/myvendor/mytheme/web/css/custom.less

When I now try to run deploy command Magento is giving me an error

pub/static/frontend/myvendor/mytheme/en_US/css/custom.css): failed to open stream: No such file or directory

I don't know if this is a version issue or not but I already tried signing off static files from backend by setting

store>configuration>advanced>Developer>Static File Setting>Sign Static Files to No

as well as trying to run the command again with admin rights.

Still, the error persists.

Answer 1

This error was actually created as custom.less file was blank and therefore magento was not generating custom.css file from it.

I don't know if it is bug or not as blank custom.css file should be generated from respective blank custom.less file.

Adding some css rules to it solves this issue.