What does it mean the RPC server is unavailable?

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Tags

1. #solutions
2. #resolve
3. #server
4. #communication
5. #following
6. #machines
7. #users
8. #error
9. #other
10. #network
11. #through
12. #devices
13. #problem
14. #having
15. #worry
16. #unavailable
17. #means
18. #windows
19. #computer