conflict with rttheme13 theme from themeforest

The fatal catchable error still persists. It’s from a theme conflict. I’m using rttheme 13 from themeforest. here is what it says:

Home \ Pastor’s Blog \
Catchable fatal error: Object of class WP_Error could not be converted to string in /home/histreas/public_html/wp-content/themes/rttheme13/functions/rt_breadcrumb.php on line 118

Thanks in advance.

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