Fatal error: Class 'Custom' contains 1 abstract method and must therefore be declared abstract or

[FounderSim]

Fatal error: Class 'CustomClass" contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (Model::save) in path/catisserie/classes/class_customclass.php on line 80

confused.

Line 80 is last line of file. This happens when I initiate the class
$boom = new CustomClass();

I got no paramaters in my constructor. it's more of a helper.