Erro ao publicar

I have the following error when I try to publish family members.
How could I fix this?
Thank you.

Warning: fopen(/home/xxx/public_html/xxx.com/wp-content/plugins/family-tree//family_data/family_84.json) [function.fopen]: failed to open stream: No such file or directory in /home/xxx/public_html/xxx.com/wp-content/plugins/family-tree/includes/custom-meta-box.php on line 466
Cannot open file (/home/xxx/public_html/xxx.com/wp-content/plugins/family-tree//family_data/family_84.json)

https://www.ads-software.com/plugins/wp-family-tree/