Make sure the file you are importing is .aia file and it does not contain any special character other than _ Underscores…
Follow what @Kshitij Said
and
Make sure that your are Importing .aia and not .apk
Try Importing in Unchive (kodular.io) to check error
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Did You download the project from this
oso_browser.aia (1.1 MB)
I uploaded the project in 
odular Successfully but has error because it was made in thunkable
I did what he actuly said but it didnt work
Yes i did , … you mean i cant open this with kodular , + i need sites which i can download aia files to use it on kodular
Why + sites just mention Kodular and the app you need and aia
Like this
Kodular aia App name
while searching in google
Search here in community.kodular.io itself
All builder have same problem
Like
You can’t upload
Thunkable<-x->Kodular
Niotron<-x->Thunkable
Niotron<-x->Kodular
But from mit you can upload to any builder
But you can’t upload to mit