"Unable to load object bundle executable" / Issue w/ external after folder sync.

Hi,
I've tried to sync my Max7 folders between my iMac and my Macbook. I've used BitTorrent Sync for this, it works fine.

The folders are now supposed to be identical.
On my iMac (master computer), i work on a project in which the Swanramp external is used.
The external is listed in the project (.maxproj) structure, and everything loads fine on the master computer (running Max 7.06 and OS X 10.10.5)

Now, if I open the same project on my Macbook (running Max 7.06 & OS X 10.11) the Swanramp external won't load and a "unable to load object bundle executable" message appears in the console.

At first, I thought that Max couldn't find the object, so I checked the paths etc (even if the folders are supposed to be identical) but that's obviously not the problem.

I've built a Snapshot of the project (on the master computer) to run another test on the macbook. And then, this .Maxzip runs perfectly on the macbook. The Swanramp object is loaded without any error message...

Do you know what can be the cause of this issue ?

Thank you.