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GTA V version? 
Up to date?
Legit or Pirate copy?
Steam/CD/Social Club?
Windows version?
Did you try to delete caches.xml and try again?
Error screenshot (if any)
System specifications
What did you do to get this issue?
What server did you get this issue on?
CitizenFX.log file
.dmp files/report IDs
If an issue with starting:
GTA V folder screenshot
GTA V/update/x64/dlcpacks screenshot
Filepath to FiveM folder
FiveM client folder screenshot
Did you try to disable/uninstall your Anti-virus?
Also add what you already tried so far.