Gateway does not exist while using Skeleton

[Arjyouu97]

I am trying to implement a custom payment gateway with the help of Skeleton method , i tried the steps shown in the documentation but its showing me the error Gateway "dpo_pay" does not exist.

I am passing the gateway name to "$this->getPayum()->getGateway()" function.

I configured the Skeleton as per documentation.

I am using a technology called dpo_pay [https://docs.dpopay.com/api/index.html]

if anyone knows the solution please help me.
Thanks