Lesson1: interp.plot_top_losses --> Attribute Error

Hello,
i wanted to have the top.losses plotted and executed the following code:

losses,idxs = interp.top_losses()
len(data.valid_ds)==len(losses)==len(idxs)

ang get this error:

I used from_folder to create a DataBunch. could that have something to do with it?

data = ImageDataBunch.from_folder(path, train=".",valid_pct=0.2, ds_tfms=tfms, size=227, num_workers=4, bs=bs).normalize(imagenet_stats)

Can somebody help?

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