Need Help with First Mod (new animal for CP)

justsariann

Newcomer
I'm trying to add corgis to SDV 1.6 using Content Patcher. This is my first mod and I'm feeling pretty lost. When I try to buy the corgi from Marnie's shop and click "purchase animals," there is an error and the screen won't open. I have attached a screenshot of the SMAPI file that says what the error is and a copy of my content. Help would be super appreciated!
 

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