Parse error: syntax error, unexpected 'default'

Hello guys,
I’m having a big problem here.
I’ve worked on a wordpress website on Wamp (localhost), with the Orizon theme.
Today, when I wanted to upload the website on the Internet, the website doesn’t work.
I’m getting the following error : “Parse error: syntax error, unexpected ‘default’ (T_DEFAULT) in /home/polysmargs/nuked/wp-content/themes/Orizon/functions.php on line 1”

I have uploaded the whole WordPress folder, I exported then imported the database, I have linked the database in the wp-config.php file.
When I change the theme, it works. Please help me.

Thanks.