Chef: EOFError - end of file reached

Yesterday got this error on Chef server. As this is a quick pro-tip, let's take a look at the solution:

• Delete all cookbooks with the problem:

# knife cookbook delete --purge <cookbook>
# knife cookbook bulk delete --purge '.+'

• Once deleted, add them again:

# knife cookbook upload -a

Go to have a cup of tea. It will take some time depending on the amount of cookbooks you have.