Mensaje de error

• Warning: file_put_contents(sites/all/themes/theme990/less/style.less.cache): failed to open stream: Permission denied en auto_less_compile() (línea 42 de /web/CLINICASILVANO/sites/all/themes/theme990/includes/less-compile.php).
• Warning: file_put_contents(sites/all/themes/theme990/css/style.css): failed to open stream: Permission denied en auto_less_compile() (línea 43 de /web/CLINICASILVANO/sites/all/themes/theme990/includes/less-compile.php).
• Warning: file_put_contents(sites/all/themes/theme990/less/style-mobile.less.cache): failed to open stream: Permission denied en auto_less_compile() (línea 42 de /web/CLINICASILVANO/sites/all/themes/theme990/includes/less-compile.php).
• Warning: file_put_contents(sites/all/themes/theme990/css/style-mobile.css): failed to open stream: Permission denied en auto_less_compile() (línea 43 de /web/CLINICASILVANO/sites/all/themes/theme990/includes/less-compile.php).