AWS EB "None of the instances are sending data."

had a problem when I was trying to deploy my django app with EB. I got something like this:

Instance has not sent any data since launch

each time I change options etc. The AWS in refers me to check my eb-engine.log file in which there is one error line:

[ERROR] An error occurred during execution of command [app-deploy] - [StageApplication]. Stop running the command. Error: staging application failed due to invalid zip file `

Moreover I consistently see in my 'Health section' app's environment 'No data'.

I've uploaded file with .zip extension as it is written. I checked my configuration file before as well as tried to change instance (to have more memory) and nothing worked. I'm pretty new in AWS and don't have really a clue how I can deal with that.

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