I cannot connect to the Bukkit server

[megagamer]

hello, I cannot connect to the server. In the console the message "done" appears and a few seconds later, this message is displayed:
[17:08:28 WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 4709ms behind, skipping 94 tick (s) 

Here is the full code:

C:\Users\CBCS\Desktop\AdventuresInMinecraft-PC>ECHO OFF

"Adventures In Minecraft"

" Minecraft Server Version is 1.12"

"  Note - make sure Minecraft is using version 1.12"

"By continuing you are indicating your agreement to our EULA https://account.mojang.com/documents/minecraft_eula)."

Appuyez sur une touche pour continuer...

Loading libraries, please wait...

[17:08:04 INFO]: Starting minecraft server version 1.12

[17:08:04 INFO]: Loading properties

[17:08:04 INFO]: Default game type: CREATIVE

[17:08:04 INFO]: Generating keypair

[17:08:05 INFO]: Starting Minecraft server on *:25565

[17:08:06 INFO]: Using default channel type

[17:08:08 INFO]: This server is running CraftBukkit version git-Bukkit-ed8c725 (MC: 1.12) (Implementing API version 1.12-R0.1-SNAPSHOT)

[17:08:09 INFO]: [RaspberryJuice] Loading RaspberryJuice v1.10

[17:08:09 WARN]: **** SERVER IS RUNNING IN OFFLINE/INSECURE MODE!

[17:08:09 WARN]: The server will make no attempt to authenticate usernames. Beware.

[17:08:09 WARN]: While this makes the game possible to play without internet access, it also opens up the ability for hackers to connect with any username they choose.

[17:08:09 WARN]: To change this, set "online-mode" to "true" in the server.properties file.

[17:08:09 INFO]: Preparing level "world"

[17:08:11 INFO]: Preparing start region for level 0 (Seed: 4657634376960002511)

[17:08:13 INFO]: Preparing spawn area: 0%

[17:08:14 INFO]: Preparing spawn area: 8%

[17:08:15 INFO]: Preparing spawn area: 33%

[17:08:16 INFO]: Preparing spawn area: 44%

[17:08:17 INFO]: Preparing spawn area: 61%

[17:08:18 INFO]: Preparing spawn area: 92%

[17:08:19 INFO]: Preparing start region for level 1 (Seed: 4657634376960002511)

[17:08:20 INFO]: Preparing spawn area: 26%

[17:08:21 INFO]: Preparing spawn area: 57%

[17:08:22 INFO]: Preparing start region for level 2 (Seed: 4657634376960002511)

[17:08:23 INFO]: [RaspberryJuice] Enabling RaspberryJuice v1.10

[17:08:23 INFO]: [RaspberryJuice] Using port 4711

[17:08:23 INFO]: [RaspberryJuice] Using ABSOLUTE locations

[17:08:23 INFO]: [RaspberryJuice] Using BOTH clicks for hits

[17:08:23 INFO]: [RaspberryJuice] ThreadListener Started

[17:08:23 INFO]: Server permissions file permissions.yml is empty, ignoring it

[17:08:23 INFO]: Done (14,051s)! For help, type "help" or "?"

[17:08:28 WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 4709ms behind, skipping 94 tick(s)

>

Please help me