Essentials Plugin Spam This Error On My Server Error :
[18:41:43 WARN]: [Essentials] Task #28 for Essentials vTeamCity generated an exception
java.lang.NullPointerException
And Sometimes Give Randomly Players Fly !
I Use Essentials For My All Server Skyblock Lobby and ..... and work fine but on survival spam this error

That is neither enough information, nor the correct place to report issues with TeamCity/Spigot Essentials. You are not using EssentialsX.