No private keys for one or both addresses

[hardstepas]

Hi.
On the Farm tab at GUI I click to "..." at the top right corner and see the message.
"No private keys for one or both addresses. Safe only if you are sending rewards to another wallet."
What that means and how to solve it?
Chia Blockchain 1.1.3

[hardstepas]

answer:
I did created first chia account. Then created the second account and deleted the first. The keys from first account were saved in the place I wrote in question. To see the keys from second account I did restored second account from seed on second PC. Once I saw this keys on the second PC I copied them to first PC