Dear jacynthe,
This can happen due to one/all reasons below:
The components directory may not be accessible (Read access blocked by server).
There might be a connection interruption while the project is synced.
What I can suggest is, try syncing the project from the back-end one more time.
(Just check the project from the projects page and click on sync button.)
If this does not works, I'd request you to send you Joomla back-end credentials to This email address is being protected from spambots. You need JavaScript enabled to view it. so that our Dev team can take a look into this issue.