Problem uploading package to assetstore

Dear unity community,

I am trying to upload my package to the assetstore.
But either the upload idles at 0% until infinity or I get the error message:

“An error occurred during assets upload
Please retry. Error receiving response from server (-1): The object was used after being disposed.”

The error happens between 1% and 4% progress.
I found similar posts already in the forum but no real solution. I am using unity 4.15 and the assetstoretools version 3.2.7.

Tried already logout - login and restart unity. The package is pretty large but I am using a decent internet connection.

Does somebody have an idea how to solve this problem?

Thank you.

Try this - make sure any file that is open is closed, you need to even create a blank scene (because if it has one of the scenes open that it uses in the package, it seems to get that error). If you forget this can happen at even 80+% or so which is a huge pain in the ass.

Thanks a lot for your help, unfortunately it did not work for me. Still the same problem.