roomRepeatedlyLeave constant Null safety

1. nertc
2. nertc
3. NERtcErrorCode
4. roomRepeatedlyLeave constant

NERtcErrorCode class

1. Constructors
2. NERtcErrorCode
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Constants
12. addTrackFail
13. channelMediaRelayInvalidState
14. channelMediaRelayPermissionDenied
15. channelMediaRelayStopFailed
16. connectFail
17. connectionNotFound
18. createDeviceSourceFail
19. createDumpFileFail
20. deviceNotFound
21. devicePreviewAlreadyStarted
22. encryptNotSuitable
23. errorFatal
24. illegalArgument
25. illegalStatus
26. invalidDeviceSourceId
27. invalidIndex
28. invalidOperation
29. invalidParam
30. invalidRender
31. invalidState
32. invalidUserId
33. invalidVideoProfile
34. lackOfResource
35. leaveChannelForSwitch
36. mediaConnectionDisconnected
37. mediaNotStarted
38. notSupported
39. ok
40. outOfMemory
41. requestJoinRoomFail
42. reserveInvalidParameter
43. reserveMoreThanTwoUser
44. reserveNoPermission
45. reserveServerFail
46. reserveTimeout
47. roomAlreadyJoined
48. roomClosed
49. roomNotJoined
50. roomRepeatedlyLeave
51. serverKicked
52. sessionNotFound
53. signalDisconnected
54. sourceNotFound
55. startDumpFail
56. streamNotFound
57. switchChannelInvalidState
58. trackNotFound
59. transmitPending
60. uninitialized
61. userNotFound