There are 2 errors I get all the time when importing existing sites.  I verify my platform and when the site is trying to import, I get this error:

This one is pretty easy to figure out, I have the wrong database info in my settings.php file.  I probably had my DB password wrong or forgot to capitalize some letter.

Ok so easy fix.  I correct the username/password/db name and click retry in Aegir.

.... wait ... wait....

Ahh failed again, new error:

This one was a a little trickier... but then I noticed it was talking about drush being in "sites/all/modules".  I was like "say wahhh?"  I realized that the old platform I had brought in had an older version of drush installed in the modules folder.

Ok so delete the drush folder... and it works...

Now to fix my multisite images issues