Website doesn't load due to theme conflict

Hello, My site is down, and showing an error. It seems like there is a conflict between wordpress and theme.

The message is this one

“Warning: Creating default object from empty value in /home/customer/www/ on line 29 Warning: Cannot modify header information - headers already sent by (output started at /home/customer/www/ in /home/customer/www/ on line 1340”

what can be the reason? Thank you

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