Loading Images to CVPixelBuffer results in invalid pixel format

In order to classify static images using my CoreML learning model, I must first load the images into a CVPixelBuffer before passing it to the classifier.prediction(image:) method.

To do this, I am using the following code:

Code Block 
import SwiftUI
struct ImageClassifier{
    var pixelBuffer: CVPixelBuffer?
    var pixelBufferStatus: CVReturn?
      
    init(width: Int, height: Int) {
        let attrs = [kCVPixelBufferCGImageCompatibilityKey: kCFBooleanTrue,kCVPixelBufferCGBitmapContextCompatibilityKey: kCFBooleanTrue]
        self.pixelBufferStatus = CVPixelBufferCreate(kCFAllocatorDefault, width, height, kCVPixelFormatType_32RGBA, attrs as CFDictionary, &self.pixelBuffer)
    }
    func loadImage(name: String){
        guard let inputImage = UIImage(named: name) else{ return }
        let beginImage = CIImage(image: inputImage)!
        let renderer = CIContext.init()
        if(self.pixelBufferStatus==kCVReturnSuccess){
            renderer.render(beginImage, to: self.pixelBuffer!)
        }else{
            print("Bad status! \(pixelBufferStatus)")
        }
    }
}

However, when I call loadImage on an image, pixelBufferStatus remains at -6680, which indicates invalidPixelFormat.

How do I fix this?