How can instal a shop in chocolat theme by Mignon

I have a troble installing a commerce plugin on chocolate theme,
I was triying wirh woocommerce and the cart press also an always display the same fatal error:

Catchable fatal error: Object of class WP_Error could not be converted to string in C:\Users\Myriam\Documents\Websites\www.obradordemama.dev\wp-content\themes\chocolat\functions.php on line 2527

I don’t know how can i fix it, and i need your help.
i’m posting here likes the other post :
https://wordpress.org/support/theme/chocolat
I thinks that si the right place for do it.