New install - user is not permitted to perform this operation

Hello everybody

I tried to install the current Ghost version, I did it following these instructions (I also have an OVH hosting): OVH - Installing Ghost on a Cloud Web hosting plan

Only I replaced NodeJS version 8 with the current 10. I can successfully create an account on the admin page and log in with it.

But all functions do not work and I always get the following error message:
Request was rejected because user is not permitted to perform this operation.

All the same whether create a post or change a setting it always gets this error message, does anyone have an idea what could be the reason?

  • What version of Ghost are you using?
    3.12.1

  • What configuration?
    OVH Webserver, NodeJS10

  • What browser?
    tried Firefox, Google Chrome and Safari

  • What errors or information do you see in the console?
    Request was rejected because user is not permitted to perform this operation.

Does nobody have any ideas? Maybe a little tip what I can/should have a look at