Warning: Missing argument 1 & Notice: Undefined variable: mapper

[jplt001]

Hi Everyone,
I having trouble right now, when I testing my service with mapper on it always show this to me
Here is the Screenshot of the error:

Please help me, Thank you in Advance for Helping me. By the way I'm using 1.0.5 Version of Apigility because on Server we are using now it only use PHP Version of 5.3 or 5.4 so I can't use latest Apigility Version. If you have know a tutorial that has a mapper tutorials available please give a link.

Thank You.