[11:17:06] [Server thread/INFO]: [Minepacks] Enabling Minepacks v2.0.3-Release
[11:17:06] [Server thread/INFO]: [Minepacks] Starting Minepacks in standalone mode!
[11:17:06] [Server thread/INFO]: [Minepacks] �[32mConfig file successfully loaded.�[0m
[11:17:06] [Server thread/INFO]: [Minepacks] �[32mLanguage file successfully loaded. Language: english Author: GeorgH93�[0m
[11:17:06] [Server thread/INFO]: [at.pcgamingfreaks.MinepacksStandalone.libs.com.zaxxer.hikari.HikariDataSource] Minepacks-Connection-Pool - Starting...
[11:17:06] [Server thread/INFO]: [at.pcgamingfreaks.MinepacksStandalone.libs.com.zaxxer.hikari.HikariDataSource] Minepacks-Connection-Pool - Start completed.
[11:17:06] [Server thread/WARN]: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Key column 'uuid' doesn't exist in table
[11:17:06] [Server thread/WARN]: at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
[11:17:06] [Server thread/WARN]: at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
[11:17:06] [Server thread/WARN]: at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
[11:17:06] [Server thread/WARN]: at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
[11:17:06] [Server thread/WARN]: at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
[11:17:06] [Server thread/WARN]: at com.mysql.jdbc.Util.getInstance(Util.java:408)
[11:17:06] [Server thread/WARN]: at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:944)
[11:17:06] [Server thread/WARN]: at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3978)
[11:17:06] [Server thread/WARN]: at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3914)
[11:17:06] [Server thread/WARN]: at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2530)
[11:17:06] [Server thread/WARN]: at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2683)
[11:17:06] [Server thread/WARN]: at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2491)
[11:17:06] [Server thread/WARN]: at com.mysql.jdbc.StatementImpl.executeUpdateInternal(StatementImpl.java:1552)
[11:17:06] [Server thread/WARN]: at com.mysql.jdbc.StatementImpl.executeLargeUpdate(StatementImpl.java:2607)
[11:17:06] [Server thread/WARN]: at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1480)
[11:17:06] [Server thread/WARN]: at at.pcgamingfreaks.MinepacksStandalone.libs.com.zaxxer.hikari.pool.ProxyStatement.executeUpdate(ProxyStatement.java:120)
[11:17:06] [Server thread/WARN]: at at.pcgamingfreaks.MinepacksStandalone.libs.com.zaxxer.hikari.pool.HikariProxyStatement.executeUpdate(HikariProxyStatement.java)
[11:17:06] [Server thread/WARN]: at at.pcgamingfreaks.MinepacksStandalone.libs.at.pcgamingfreaks.Database.SQLTableValidator.validate(SQLTableValidator.java:93)
[11:17:06] [Server thread/WARN]: at at.pcgamingfreaks.MinepacksStandalone.libs.at.pcgamingfreaks.Database.DBTools.updateDB(DBTools.java:58)
[11:17:06] [Server thread/WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Database.MySQL.checkDB(MySQL.java:59)
[11:17:06] [Server thread/WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Database.SQL.(SQL.java:59)
[11:17:06] [Server thread/WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Database.MySQL.(MySQL.java:36)
[11:17:06] [Server thread/WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Database.Database.getDatabase(Database.java:111)
[11:17:06] [Server thread/WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Minepacks.load(Minepacks.java:189)
[11:17:06] [Server thread/WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Minepacks.onEnable(Minepacks.java:147)
[11:17:06] [Server thread/WARN]: at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263)
[11:17:06] [Server thread/WARN]: at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:338)
[11:17:06] [Server thread/WARN]: at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:419)
[11:17:06] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugin(CraftServer.java:464)
[11:17:06] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugins(CraftServer.java:378)
[11:17:06] [Server thread/WARN]: at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:465)
[11:17:06] [Server thread/WARN]: at net.minecraft.server.v1_14_R1.DedicatedServer.init(DedicatedServer.java:280)
[11:17:06] [Server thread/WARN]: at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:856)
[11:17:06] [Server thread/WARN]: at java.lang.Thread.run(Thread.java:748)
[11:17:06] [Server thread/INFO]: [Minepacks] �[32mItem name language file successfully loaded. Language: english Author: GeorgH93�[0m
[11:17:06] [Server thread/INFO]: [Minepacks] Loading item translations ...
[11:17:06] [Server thread/INFO]: [Minepacks] Finished loading item translations for 830 items.
[11:17:06] [Server thread/INFO]: [Minepacks] �[32m Minepacks has been enabled! �[33m :) �[0m

This should fix the problem: https://github.com/GeorgH93/Minepacks/releases/download/v2.0.4/Minepacks-2.0.4-Release.jar

the first time load:
[21:31:39 INFO]: [Minepacks] Enabling Minepacks v2.0.4-Release
[21:31:39 INFO]: [Minepacks] Starting Minepacks in standalone mode!
[21:31:39 INFO]: [Minepacks] Config file successfully loaded.
[21:31:39 INFO]: [Minepacks] Language file successfully loaded. Language: english Author: GeorgH93
[21:31:39 INFO]: [at.pcgamingfreaks.MinepacksStandalone.libs.com.zaxxer.hikari.HikariDataSource] Minepacks-Connection-Pool - Starting...
[21:31:39 INFO]: [at.pcgamingfreaks.MinepacksStandalone.libs.com.zaxxer.hikari.HikariDataSource] Minepacks-Connection-Pool - Start completed.
[21:31:40 WARN]: java.sql.SQLException: Cannot add foreign key constraint
[21:31:40 WARN]: at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:965)
[21:31:40 WARN]: at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3978)
[21:31:40 WARN]: at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3914)
[21:31:40 WARN]: at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2530)
[21:31:40 WARN]: at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2683)
[21:31:40 WARN]: at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2491)
[21:31:40 WARN]: at com.mysql.jdbc.StatementImpl.executeUpdateInternal(StatementImpl.java:1552)
[21:31:40 WARN]: at com.mysql.jdbc.StatementImpl.executeLargeUpdate(StatementImpl.java:2607)
[21:31:40 WARN]: at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1480)
[21:31:40 WARN]: at at.pcgamingfreaks.MinepacksStandalone.libs.com.zaxxer.hikari.pool.ProxyStatement.executeUpdate(ProxyStatement.java:120)
[21:31:40 WARN]: at at.pcgamingfreaks.MinepacksStandalone.libs.com.zaxxer.hikari.pool.HikariProxyStatement.executeUpdate(HikariProxyStatement.java)
[21:31:40 WARN]: at at.pcgamingfreaks.MinepacksStandalone.libs.at.pcgamingfreaks.Database.SQLTableValidator.validate(SQLTableValidator.java:93)
[21:31:40 WARN]: at at.pcgamingfreaks.MinepacksStandalone.libs.at.pcgamingfreaks.Database.DBTools.updateDB(DBTools.java:58)
[21:31:40 WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Database.MySQL.checkDB(MySQL.java:66)
[21:31:40 WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Database.SQL.(SQL.java:59)
[21:31:40 WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Database.MySQL.(MySQL.java:36)
[21:31:40 WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Database.Database.getDatabase(Database.java:111)
[21:31:40 WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Minepacks.load(Minepacks.java:189)
[21:31:40 WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Minepacks.onEnable(Minepacks.java:147)
[21:31:40 WARN]: at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263)
[21:31:40 WARN]: at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:338)
[21:31:40 WARN]: at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:419)
[21:31:40 WARN]: at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugin(CraftServer.java:464)
[21:31:40 WARN]: at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugins(CraftServer.java:378)
[21:31:40 WARN]: at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:465)
[21:31:40 WARN]: at net.minecraft.server.v1_14_R1.DedicatedServer.init(DedicatedServer.java:280)
[21:31:40 WARN]: at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:856)
[21:31:40 WARN]: at java.lang.Thread.run(Thread.java:748)
[21:31:40 WARN]: [Minepacks] Failed to extract file "/lang/items_chs.yml"!
[21:31:40 INFO]: [Minepacks] File "/lang/items_en.yml" extracted successfully!
[21:31:40 INFO]: [Minepacks] Item name language file successfully loaded. Language: english Author: GeorgH93
[21:31:40 INFO]: [Minepacks] Loading item translations ...
[21:31:40 INFO]: [Minepacks] Finished loading item translations for 830 items.
[21:31:40 INFO]: [Minepacks] Minepacks has been enabled! :)

the second time load:
[21:33:06 INFO]: [Minepacks] Enabling Minepacks v2.0.4-Release
[21:33:06 INFO]: [Minepacks] Starting Minepacks in standalone mode!
[21:33:06 INFO]: [Minepacks] Config file successfully loaded.
[21:33:06 INFO]: [Minepacks] Language file successfully loaded. Language: english Author: GeorgH93
[21:33:06 INFO]: [at.pcgamingfreaks.MinepacksStandalone.libs.com.zaxxer.hikari.HikariDataSource] Minepacks-Connection-Pool - Starting...
[21:33:07 INFO]: [at.pcgamingfreaks.MinepacksStandalone.libs.com.zaxxer.hikari.HikariDataSource] Minepacks-Connection-Pool - Start completed.
[21:33:07 WARN]: java.sql.SQLException: Cannot add foreign key constraint
[21:33:07 WARN]: at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:965)
[21:33:07 WARN]: at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3978)
[21:33:07 WARN]: at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3914)
[21:33:07 WARN]: at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2530)
[21:33:07 WARN]: at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2683)
[21:33:07 WARN]: at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2491)
[21:33:07 WARN]: at com.mysql.jdbc.StatementImpl.executeUpdateInternal(StatementImpl.java:1552)
[21:33:07 WARN]: at com.mysql.jdbc.StatementImpl.executeLargeUpdate(StatementImpl.java:2607)
[21:33:07 WARN]: at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1480)
[21:33:07 WARN]: at at.pcgamingfreaks.MinepacksStandalone.libs.com.zaxxer.hikari.pool.ProxyStatement.executeUpdate(ProxyStatement.java:120)
[21:33:07 WARN]: at at.pcgamingfreaks.MinepacksStandalone.libs.com.zaxxer.hikari.pool.HikariProxyStatement.executeUpdate(HikariProxyStatement.java)
[21:33:07 WARN]: at at.pcgamingfreaks.MinepacksStandalone.libs.at.pcgamingfreaks.Database.SQLTableValidator.validate(SQLTableValidator.java:93)
[21:33:07 WARN]: at at.pcgamingfreaks.MinepacksStandalone.libs.at.pcgamingfreaks.Database.DBTools.updateDB(DBTools.java:58)
[21:33:07 WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Database.MySQL.checkDB(MySQL.java:66)
[21:33:07 WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Database.SQL.(SQL.java:59)
[21:33:07 WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Database.MySQL.(MySQL.java:36)
[21:33:07 WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Database.Database.getDatabase(Database.java:111)
[21:33:07 WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Minepacks.load(Minepacks.java:189)
[21:33:07 WARN]: at at.pcgamingfreaks.MinepacksStandalone.Bukkit.Minepacks.onEnable(Minepacks.java:147)
[21:33:07 WARN]: at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263)
[21:33:07 WARN]: at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:338)
[21:33:07 WARN]: at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:419)
[21:33:07 WARN]: at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugin(CraftServer.java:464)
[21:33:07 WARN]: at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugins(CraftServer.java:378)
[21:33:07 WARN]: at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:465)
[21:33:07 WARN]: at net.minecraft.server.v1_14_R1.DedicatedServer.init(DedicatedServer.java:280)
[21:33:07 WARN]: at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:856)
[21:33:07 WARN]: at java.lang.Thread.run(Thread.java:748)
[21:33:07 INFO]: [Minepacks] Item name language file successfully loaded. Language: english Author: GeorgH93
[21:33:07 INFO]: [Minepacks] Loading item translations ...
[21:33:07 INFO]: [Minepacks] Finished loading item translations for 830 items.
[21:33:07 INFO]: [Minepacks] Minepacks has been enabled! :)

Although there is an error reported above, the original data can be loaded.

The error should not cause problems as long as you are not using the cooldown sync feature.
It should be fixed with this release: https://github.com/GeorgH93/Minepacks/releases/download/v2.0.5/Minepacks-2.0.5-Release.jar

Great. The problem has been solved.