Sort:  

Sorry for the late answer! I've been (very busy)³ in these days... Looks like you entered an unknown public owner key. Do you still need help with this?

I can not find Owner Private Key in steemit.com
Only the I know the master key, posting private key and the active private key.
If I have to use a owner private Key to change my password using your tool,
Because the owner private key is unknown, there are restrictions on the use of the tool.

If you have the master key, you can just use the Key Generator Tool on SteemWorld to see your private owner key.

As it's stated in the description:

Key Generator
Here you can create master keys for new accounts and for account recovery requests or see your private and public keys for your current master password.

oh GooD!
This is clear. Thank you very much.