ModuleNotFoundError: No module named 'fastai.callback.all'; 'fastai.callback' is not a package

I had earlier post an error when I run this script
#id first_training

#caption Results from the first training


from import *

from fastai import * 

path = untar_data(URLs.PETS)/'images'

def is_cat(x): return x[0].isupper()

dls = ImageDataLoaders.from_name_func(

    path, get_image_files(path), valid_pct=0.2, seed=42,

    label_func=is_cat, item_tfms=Resize(224))

learn = cnn_learner(dls, resnet34, metrics=error_rate)


so i got a solution to install fastbook and fastai ~

!pip install -Uqq fastbook

import fastbook


i get this error ~
ModuleNotFoundError: No module named 'fastai.callback.all'; 'fastai.callback' is not a package

1 Like

HI bhinav_Kudva Hope all is well!

The posts here may help you solve your problem.

Cheers mrfabulous1 :smiley: :smiley:

Yes. I got the same error message.

still facing the same error

I had the same issue, and following these exact steps solved my problem:


Hi andyjakubowski, bhinav_Kudva, james3

hope you are all having a wonderful day!

This is how Colab works If you do not do a mouse click about every fifteen minutes or so it times out and all variables are lost.
So I save the notebook whenever I make changes and rerun it.

There is a paid version of Colab, but I am not sure If this does the same thing.

I use pyautogui, if I want to go away for up to 12hrs and I want the notebook to continue running.

I also use the runall option in the RUNTIME menu so it runs all the cells until it gets to the end or finds an error.
This way I get to the end of the notebook, and can see the results even if they are no longer available.

Cheers mrfabulous1 :smiley: :smiley:

1 Like

I faced the same Error when i accessed 01_intro.ipynb notebook from This error seems occurring mainly form version mismatch in fastai,fastai2,fastcore Try to run Bellow and restart the notebook again. These version combination seems to be working.
!pip install fastai==2.0.15
!pip install fastai2==0.0.30
!pip install fastcore==1.0.16.

PS ~ This issue is still open in fastai repo


This is working, thanks

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I’m stilling getting this error on Google Collab. Right out the box I cannot train a model :frowning:

Hi Syirrus Hope your well!
Some people have used the following to solve the problem on Colab.

!pip install fastbook --upgrade

Cheers mfabulous1 :smiley: :smiley:

1 Like

Thank you!

Press “Runtime” -> “Restart Runtime” and it leads you to solve the issue.


Hi mrnobody hope all is well!

After working on the same notebook everyday for about two weeks and earlier today. I came back this evening ran the the first few cells, then when I ran this cell from import *

I recieved the error

ModuleNotFoundError: No module named ‘fastai.callback.all’; ‘fastai.callback’ is not a package

This time only restarting the runtime would clear it.

It looks like I now have two things to try if I get this error again.

:smiley: :smiley:

1 Like

@mrfabulous1 if you getting started (or anyone else, by the way), i’ve started a public community here

we’re a few already (8 or so :joy:) feel free to fall in.

I had this same issue the other day. What I found was that I did not have a locally saved version on my Drive, which was causing the error. I created a copy and worked off of that and the issue was gone.


This worked for me, thanks

Yeah , upgrading packages and restarting runtime solves the problem !!!

Worked for me as well. Thank you

Still facing the same issue. nothing works

Yes updating the packages and restarting the notebook solves the problem