Error loading private key after 0.3.5.7 upgrade

Hi,

I just upgraded my tor relay from 0.3.4.9 to 0.3.5.7 via the official debian repository. Now my relay is unable to start up:

Jan 10 11:24:48.000 [err] Error loading private key. Jan 10 11:24:48.000 [err] Error initializing keys; exiting

What can I do to fix it?

root@DietPi:/var/lib/tor/keys# ls -lah total 44K drwx--S--- 2 tor tor 4.0K Jan 5 18:55 . drwx--S--- 5 tor tor 4.0K Jan 10 11:24 .. -rw-r--r-- 1 tor tor 64 Dec 13 2015 ed25519_master_id_public_key -rw-r--r-- 1 tor tor 96 Dec 13 2015 ed25519_master_id_secret_key -rw------- 1 tor tor 172 Dec 18 23:00 ed25519_signing_cert -rw------- 1 tor tor 96 Dec 18 23:00 ed25519_signing_secret_key -rw-r--r-- 1 tor tor 902 Nov 6 2013 secret_id_key -rw------- 1 tor tor 887 Jan 5 18:55 secret_onion_key -rw------- 1 tor tor 96 Jan 5 18:55 secret_onion_key_ntor -rw------- 1 tor tor 96 Dec 8 18:07 secret_onion_key_ntor.old -rw------- 1 tor tor 887 Dec 8 18:07 secret_onion_key.old

Trac:
Username: anong