OS?

Windows 7 x64

Versions.

Please run ng --version. If there's nothing outputted, please run in a Terminal: node --version and paste the result here:

angular-cli: 1.0.0.-beta.15
node: 4.4.7

Repro steps.

The app was created with angular-cli: ng new
I added semantic.min.css under src/assets folder

in angular-cli.json,
"apps" : [
{
"styles": [
"../src/assets/sematic.min.css",
"styles.css"
],
}
]

The log given by the failure.

run: ng serve

ERROR in multi styles
Module not found: Error: Can't resolve 'c:\working\ng2\reddit\src\assets\sematic.min.css' in 'c:\working\ng2\reddit\node_modules\angular-cli\models'
@ multi styles

Mention any other details that might be useful.