Failed to open big C2 project into C3

Hi,

I'm currently trying to roughly import (after deleting all unsupported addons) a C2 project into C3. The project seems to load quite normally, but at around 82% of the loading bar, I get the following message:

Failed to open project. Check it is a valid Construct 2 single-file (.capx) project.

It is definitely a valid C2 capx that I can open in C2.

Is it something that I'm doing wrong ? Otherwise I can send the code to the scirra team if they would like to try for themselves.

Thanks!