Server error: could not upload project

I'm using punya built from sources using Vagrant VM. I succesfully build the project and start the server on my machine but whenever I access app inventor to create/import my apps the situation restarts from zero. It does not save projects and even if i try to save a project and open it I get an empty one.
What can I do to save my applications?
Thanks a lot in advance

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Are you using punya or app inventor? Those are two different products.

I'm using Punya

When I try to upload a project I get the following error: /vagrant/appinventor/appengine/build/war/WEB-INF/appengine-generated/encoded_gs_key:L2dzL2FwcF9kZWZhdWx0X2J1Y2tldC81OTEwOTc0NTEwOTIzNzc2L3NyYy9hcHBpbnZlbnRvci9haV9hbnR1c19sb25nby9vbmxpbmVfZG9jdW1lbnRfc3RvcmVfZXhhbXBsZV9jbGllbnQvU2NyZWVuMS5ia3k (Protocol error)

Could this be the same solution to my problem?