invalid training data the output size of the last layer (1000) does not match the number of classes (2)

hi im using vgg16 app to classify images of CAT scan

and gives me this error

for training i have 1000 images of covid and 999 for non-covid

i have resized them all 100x100 but also the original images that are diffrent sizes gives me the same error

i tried to play with the network and add another calssify layer but couldnt connect the boxes

(im new to this and have no idea what im doing)