my macsafe yellow light is blinking when connect to charge nd not charge my mac

when i connect the charger to charge my mac, the mac is not charge nd yellow light is blinking in the macsafe charger.

that's why i run the digonestic but here show that no issue is found in my mac.so i want to know that problem is where ,in my mac or charger nd how to fix it because my mac is only 2 week old.