Multiple level of approvals

Summary

Performance Goals approvals

Content

Hi Everyone,
We are trying to create an approval with multiple levels in order to approve performance goals. We have two different hierarchical lines.
The approvals need to be sent to the first line manager and if the first one is empty, it has to be sent to second line manager.
We succeed to send to the first level but when We tried with the second one, we faced an error.

Is it possible to do this ?
Thanks a lot for your help !