show issues in Sprint

[Tinatin Kobakhidze]

1. I had 2 boards on Jira Software. Lets name that Board A and Board B.
2. on Board B i had created the Sprint with 17 issues in that.
3. then i deleted Board A and my sprint in Board B disappeared.
4. after that when i am trying to create sprint or backlog issues are not visible.

can anyone tell me what is the problem, or how can i reconfigure my JIRA

Sincerely,

Tina