Essentials cant unjail

I use the plugin essentials and i jailed my friend and the command to unjail him didn't work this is what i tried /unjail jacksflight and it said the command is /unjail (player) jail name datediff and if i do /unjail jacksflight jail1 it says this jail does not exist i also tried /togglejail and i got the same results please help

 

/setjail (in the jail)
/setunjail (outside jail, like at spawn or something)

 

the /setunjail says unknown command

 

You use /jail <player name> to unjail.

And to unset a jail, its /deljail <jail name>

Read the essentials wiki or whatever, it explains it VERY clearly.

 

i say /unjail (person) jail1 and it says that jail does not exist

 

If the Essentials jail does not work, use my plugin, JailLikeHell! The link is in my signature.

 

When i try put the jaillikehell file in my plugins folder and when i started my server it said [SEVERE] Could not load 'plugins\JailLikeHell_v4.1.9.jar' in folder 'plugins'

 

1. What's the full error?
2. Download the newest version of JailLikeHell.

 

When i launch my server after installing jail like hell i get that errror message [SEVERE] Could not load 'plugins\JailLikeHell_v4.1.9.jar' in folder 'plugins'

 

What's the full error?
You can find it in the server.log file.

 

just do /jail on him again.