DioxusLabs/dioxus · error

Invalid css for file

Error message

Invalid css for file `{}`
Error:
{}

What it means

Wraps a transform_css failure in process_css_module: the module's CSS content could not be parsed/transformed (class names rewritten with the module hash). The faulting input is the user-authored CSS file content; the error embeds the underlying grass/transform error after 'Error:'. Fix the invalid CSS in the file named in the message.

Solutions

1. The CSS is invalid. Fix the CSS syntax error shown in the message.

When it happens

Trigger: Thrown at packages/cli/src/opt/css.rs:76 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of DioxusLabs/dioxus@24f6a829df (2026-08-23). Data as JSON: /api/errors/36f93d199dce33f1. Report an issue: GitHub.

Appendix: source

Thrown at packages/cli/src/opt/css.rs:76

            anyhow!(
                "Failed to read name of css module file `{}`.",
                source.display()
            )
        })?
        .strip_suffix(".css")
        .ok_or_else(|| {
            anyhow!(
                "Css module file `{}` should end with a `.css` suffix.",
                source.display(),
            )
        })?
        .to_string();

    src_name.push('-');

    let hash = create_module_hash(source);
    let css = transform_css(css.as_str(), hash.as_str()).map_err(|error| {
        anyhow!(
            "Invalid css for file `{}`\nError:\n{}",
            source.display(),
            error
        )
    })?;

    // Minify CSS
    let css = if css_options.minified() {
        // Try to minify the css. If we fail, log the error and use the unminified css
        match minify_css(&css) {
            Ok(minified) => minified,
            Err(err) => {
                tracing::error!(
                    "Failed to minify css module; Falling back to unminified css. Error: {}",
                    err
                );
                css
            }

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