[Bug] NullReferenceException: Object reference not set to an instance of an object in CreateNFT method

[viol3]

Describe the bug
Trying in devnet, 0.7 SOL balanced wallet. Succesfully uploads metadata. But after I click Deploy button when I want to use Candy Machine. It gives null reference error.

To Reproduce
Steps to reproduce the behavior:
Create your candy machine and start to deploy after uploaded assets.

Expected behavior
Should deploy succesfully with valid wallet, in devnet.

Screenshots

Desktop (please complete the following information):

• OS Windows
• Solana Unity SDK Version 1.2.5
• Unity Version 2023.2.20f1