each() function deprecation

[Itedjere]

I am getting this error message, please how can this be resolved.
PHP Deprecated: The each() function is deprecated. This message will be suppressed on further calls in /home/propertytaxlock/sites/www/backend/infusionsoft_novak/Infusionsoft/xmlrpc.inc on line 3100

And in my browser console, I see this message, whenever I try calling
new Infusionsoft_Contact();
Infusionsoft_ContactService::removeFromGroup();
Infusionsoft_ContactService::addToGroup();

[DatabaseError]Error loading contact\nAttempted: 1 time(s).