Ivan Talalaev

I faced that issue when forget about **-1** for x_max and y_max in dataset loader 

But in some cases one can meet the same error even with correct `-tags`  That is because missunderstanding `-source` tag. **For local folder you should use either `file://./migrations` or...

Oh sorry for that, the problem was in ANACONDA. Don't use that shit. I meet collisions with anaconda all the time when I'm installing smth.