ConvLearner not defined

I’m trying to run the lesson1 code. After struggling and removing about 10 conda environments,i could finally remove Module not found error of fastai.transforms by giving path to the fastai/old on top my python script.

After all that now i get this error,
ConvLearner not defined. Is there any way to run the codes presented in the lessons without any hassle. Or are there any docs that can be referred to know the changes in version 0.7 to continue the lessons.