Installatron error : "Successfully detected the source inst"

I tried to import my opencart site from the old hosting to godaddy hosting. I used the Installatron import features. After putting the required information and click proceed, I always ended up getting the error :

Successfully detected the source installed application's database information, but the information isn't working. This wizard will only succeed if the source install is working without error.

Any idea what solution to solve this?

Are you transferring files from one hosting to another ?

If so, take separate backups of source files and database.
Copy files to home directory and import database from phpmyadmin.

found the issues. Turns out I don't have enough free space.

thanks