MIT App Inventor won't load

So I begun at testing so I started to live testing. But one of my projects won't loading. It just stuck at the connection screen. But when I loading different projects it's loaded without error message. No error message cames up.

Export and upload the aia for the problem project.

There is a sensitive information that I can't share with other people.

If you're stuck connecting to the Companion, try the latest version.

If an updated Companion won't help, load the project into the code.appinventor.mit.edu server, which has a larger capacity.

Can you build the project?

Finally, are all the extensions in the project compatible with SDK34?

Doesn't it show an error on the PC or in the companion?