Robust tracking of blobs?

I have an image feature extraction problem. The input images are binary (black and white) and may contain blobs of ...

ValueError: Shape must be rank 1 but is rank 0 for 'ROIAlign/Crop' (op: 'CropAndResize') with input shapes: [2,360,475,3], [1,4], [], [2]?

I tried to give all input in this function but it comes out problem like below , i not sure what is the empty [] is ...