Forumlar / Cotonti / General / Error in resources.php

Hello.

Activate CONFIGURATION / PERFORMANCE / Consolidate header and footer resources (JS/CSS): ON

and error CSS THEME SYDNEY --> file --> SYSTEM / resources.php

Line 129:   $code = static::minify(file_get_contents($fileName), $type);

( I have erased this line temporarily )

Is there a solution? 

OK Thanks!