Error reading data from firebase

Hello, good evening. I’d like to know why my app is showing this error. Could you tell me it’s because they’re global variants? If I add local variants, it throws the same error! Any idea why the dynamic cardview isn’t loading with the elements it reads from Firebase, such as the image, name, price, and stock?



What is the error? Also the json parsing does not seem to be right

Thanks for responding, what I want to do is read the firebase structure that contains an image, name, price and stock, and have the cardview appear in my app with the image on the left and the rest of the data on the right, when the application calls firebase, it responds with that error, it should be noted that the firebase structure is correctly in json