### Minecraft Version: `1.19.2`
### Essential Client Version: `1.3.1`
### Arucas Version: `2.0.1`
### Script:
```kt
// WorldEditCUI
import * from Minecraft;
import Direction from minecraft.PosUtils;

NIL_UUID = "00000000-0000-0000-0000-000000000000";
FIRST_POS = null;
SECOND_POS = null;
HIDDEN = false;
WAIT_FOR_NEXT = {};

BOX = new BoxShape(0, 0, 0);
BOX.setOpacity(10);
BOX.setOutlineWidth(2);
BOX.setOutlineColour(255, 255, 255);

fun expand(distance, direction) {
    index = null;
    switch (direction) {
        case Direction.NORTH, Direction.SOUTH -> index = 2;
        case Direction.UP, Direction.DOWN -> index = 1;
        case Direction.EAST, Direction.WEST -> index = 0;
    }
    if (index == null || FIRST_POS == null || SECOND_POS == null) {
        return;
    }
    first = FIRST_POS.multiply(direction.vector);
    second = SECOND_POS.multiply(direction.vector);
    if (first.toList()[index] > second.toList()[index]) {
        FIRST_POS = FIRST_POS.add(direction.vector.multiply(distance, distance, distance));
    } else {
        SECOND_POS = SECOND_POS.add(direction.vector.multiply(distance, distance, distance));
    }
}

fun messageToPos(message) {
    x, y, z = message.find("(-?[0-9]+, -?[0-9]+, -?[0-9]+)")[0].split(", ");
    return new Pos(x.toNumber(), y.toNumber(), z.toNumber());
}

fun waitForNext(message, function) {
    WAIT_FOR_NEXT.put(message, function);
}

fun getDirection(directionString) {
    direction = Direction.getEntityFacingFirst(Player.get());
    if (directionString != null) {
        argDirection = Direction.fromString(directionString);
        if (argDirection == Direction.NONE) {
            switch (directionString) {
                case "left" -> direction = direction.left();
                case "right" -> direction = direction.right();
                case "back" -> direction = direction.opposite();
                case "forward", "me" -> { }
                default -> return null;
            }
        } else {
            direction = argDirection;
        }
    }
    return direction;
}

new GameEvent("onReceiveMessage", fun(uuid, message) {
    try {
        if (uuid != NIL_UUID) {
            return;
        }
        if (message == "Selection cleared.") {
            FIRST_POS = SECOND_POS = null;
        } else if (message.contains("First position set to")) {
            FIRST_POS = messageToPos(message);
        } else if (message.contains("Second position set to")) {
            SECOND_POS = messageToPos(message);
        } else {
            function = WAIT_FOR_NEXT.remove(message.subString(0, 15));
            if (function != null) {
                function();
            }
        }
    } catch(error); // Not advised xD
}); 

new GameEvent("onSendMessage", fun(message) {
    try {
        if (message.startsWith("//")) {
            commandArgs = message.subString(2, len(message)).split(" ");
            commandLength = len(commandArgs);
            switch (commandArgs[0]) {
                case "shift" -> {
                    distance = commandArgs[1].toNumber();
                    directionString = null;
                    if (commandLength == 3) {
                        directionString = commandArgs[2];
                    }
                    direction = getDirection(directionString);
                    if (direction == null) {
                        return;
                    }
                    waitForNext("Region shifted.", fun() {
                        if (FIRST_POS == null || SECOND_POS == null) {
                            return;
                        }
                        shift = direction.vector.multiply(distance, distance, distance);
                        FIRST_POS = FIRST_POS.add(shift);
                        SECOND_POS = SECOND_POS.add(shift);
                    });
                }
                case "expand" -> {
                    if (commandArgs[1] == "vert") {
                        if (commandLength != 3) {
                            return;
                        }
                        distance = Math.abs(commandArgs[2].toNumber());
                        waitForNext("Region expanded", fun() {
                            expand(distance, Direction.UP);
                            expand(distance, Direction.DOWN);
                        });
                        return;
                    }
                    distance = commandArgs[1].toNumber();
                    directionString = null;
                    if (commandLength == 3) {
                        directionString = commandArgs[2];
                    }
                    direction = getDirection(directionString);
                    if (direction == null) {
                        return;
                    }
                    waitForNext("Region expanded", fun() {
                        expand(distance, direction);
                    });
                }
            }
        }
    } catch(error); // This is not advised xD
});

worldEditCommand = {
    "name": "worldEditCUI",
    "subcommands": {
        "hidden <boolean>": {
            "": fun(bool) {
                HIDDEN = bool;
            }
        },
        "renderThrough <boolean>": {
            "": fun(bool) {
                BOX.setRenderThroughBlocks(bool);
            }
        }
    },
    "arguments": {
        "boolean": {"type": "Boolean"}
    }
};

MinecraftClient.get().addCommand(worldEditCommand);

while (true) {
    if (HIDDEN || FIRST_POS == null || SECOND_POS == null) {
        BOX.stopRendering();
    } else {
        BOX.setPos1(FIRST_POS);
        BOX.setPos2(SECOND_POS);
        BOX.render();
    }
    sleep(100);
}
```
### StackTrace:
```
FatalError: An unexpected error was thrown
> File: WorldEditCUI, Line: 62, Column: 5, In: new GameEvent::2
62 | new GameEvent("onReceiveMessage", fu ...
   |     ^
   |     Range [0, 15) out of bounds for length 4
> File: $internal
> File: WorldEditCUI, Line: 74, Column: 53, In: <String>.subString::2
74 | ... NEXT.remove(message.subString(0, ...
   |                         ^
   |                         Range [0, 15) out of bounds for length 4
StackTrace (most recent call last)
Caused by: StringIndexOutOfBoundsException - Range [0, 15) out of bounds for length 4
```
### Crash:
```
me.senseiwells.arucas.exceptions.FatalError: An unexpected error was thrown
Caused by: java.lang.StringIndexOutOfBoundsException: Range [0, 15) out of bounds for length 4
	at java.base/jdk.internal.util.Preconditions$1.apply(Preconditions.java:55)
	at java.base/jdk.internal.util.Preconditions$1.apply(Preconditions.java:52)
	at java.base/jdk.internal.util.Preconditions$4.apply(Preconditions.java:213)
	at java.base/jdk.internal.util.Preconditions$4.apply(Preconditions.java:210)
	at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:98)
	at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckFromToIndex(Preconditions.java:112)
	at java.base/jdk.internal.util.Preconditions.checkFromToIndex(Preconditions.java:349)
	at java.base/java.lang.String.checkBoundsBeginEnd(String.java:4589)
	at java.base/java.lang.String.substring(String.java:2703)
	at me.senseiwells.arucas.builtin.StringDef.subString(StringDef.kt:302)
	at me.senseiwells.arucas.builtin.StringDef.access$subString(StringDef.kt:21)
	at me.senseiwells.arucas.builtin.StringDef$defineMethods$14.invoke(StringDef.kt:110)
	at me.senseiwells.arucas.builtin.StringDef$defineMethods$14.invoke(StringDef.kt:110)
	at me.senseiwells.arucas.utils.MemberFunction$Auto.invoke(ArucasFunctions.kt:345)
	at me.senseiwells.arucas.utils.MemberFunction$Auto.invoke(ArucasFunctions.kt:337)
	at me.senseiwells.arucas.builtin.FunctionDef.call$Arucas(FunctionDef.kt:21)
	at me.senseiwells.arucas.classes.ClassInstance.call$Arucas(ClassInstance.kt:16)
	at me.senseiwells.arucas.core.Interpreter.call(Interpreter.kt:141)
	at me.senseiwells.arucas.classes.ClassInstance.callMember(ClassInstance.kt:23)
	at me.senseiwells.arucas.classes.ClassInstance.callMember$default(ClassInstance.kt:19)
	at me.senseiwells.arucas.core.Interpreter.visitMemberCall(Interpreter.kt:760)
	at me.senseiwells.arucas.core.Interpreter.visitMemberCall(Interpreter.kt:20)
	at me.senseiwells.arucas.nodes.MemberCallExpression.visit$Arucas(Expressions.kt:347)
	at me.senseiwells.arucas.core.Interpreter.evaluate(Interpreter.kt:167)
	at me.senseiwells.arucas.core.Interpreter.visitMemberCall(Interpreter.kt:742)
	at me.senseiwells.arucas.core.Interpreter.visitMemberCall(Interpreter.kt:20)
	at me.senseiwells.arucas.nodes.MemberCallExpression.visit$Arucas(Expressions.kt:347)
	at me.senseiwells.arucas.core.Interpreter.evaluate(Interpreter.kt:167)
	at me.senseiwells.arucas.core.Interpreter.visitAssign(Interpreter.kt:675)
	at me.senseiwells.arucas.core.Interpreter.visitAssign(Interpreter.kt:20)
	at me.senseiwells.arucas.nodes.AssignExpression.visit$Arucas(Expressions.kt:245)
	at me.senseiwells.arucas.core.Interpreter.evaluate(Interpreter.kt:167)
	at me.senseiwells.arucas.core.Interpreter.visitExpression(Interpreter.kt:348)
	at me.senseiwells.arucas.core.Interpreter.visitExpression(Interpreter.kt:20)
	at me.senseiwells.arucas.nodes.ExpressionStatement.visit(Statements.kt:106)
	at me.senseiwells.arucas.core.Interpreter.execute(Interpreter.kt:161)
	at me.senseiwells.arucas.core.Interpreter.visitStatements(Interpreter.kt:336)
	at me.senseiwells.arucas.core.Interpreter.visitStatements(Interpreter.kt:20)
	at me.senseiwells.arucas.nodes.Statements.visit(Statements.kt:69)
	at me.senseiwells.arucas.core.Interpreter.execute(Interpreter.kt:161)
	at me.senseiwells.arucas.core.Interpreter.executeNext(Interpreter.kt:164)
	at me.senseiwells.arucas.core.Interpreter.visitScope(Interpreter.kt:340)
	at me.senseiwells.arucas.core.Interpreter.visitScope(Interpreter.kt:20)
	at me.senseiwells.arucas.nodes.ScopeStatement.visit(Statements.kt:80)
	at me.senseiwells.arucas.core.Interpreter.execute(Interpreter.kt:161)
	at me.senseiwells.arucas.core.Interpreter.visitIf(Interpreter.kt:357)
	at me.senseiwells.arucas.core.Interpreter.visitIf(Interpreter.kt:20)
	at me.senseiwells.arucas.nodes.IfStatement.visit(Statements.kt:122)
	at me.senseiwells.arucas.core.Interpreter.execute(Interpreter.kt:161)
	at me.senseiwells.arucas.core.Interpreter.executeNext(Interpreter.kt:164)
	at me.senseiwells.arucas.core.Interpreter.visitScope(Interpreter.kt:340)
	at me.senseiwells.arucas.core.Interpreter.visitScope(Interpreter.kt:20)
	at me.senseiwells.arucas.nodes.ScopeStatement.visit(Statements.kt:80)
	at me.senseiwells.arucas.core.Interpreter.execute(Interpreter.kt:161)
	at me.senseiwells.arucas.core.Interpreter.visitIf(Interpreter.kt:357)
	at me.senseiwells.arucas.core.Interpreter.visitIf(Interpreter.kt:20)
	at me.senseiwells.arucas.nodes.IfStatement.visit(Statements.kt:122)
	at me.senseiwells.arucas.core.Interpreter.execute(Interpreter.kt:161)
	at me.senseiwells.arucas.core.Interpreter.executeNext(Interpreter.kt:164)
	at me.senseiwells.arucas.core.Interpreter.visitScope(Interpreter.kt:340)
	at me.senseiwells.arucas.core.Interpreter.visitScope(Interpreter.kt:20)
	at me.senseiwells.arucas.nodes.ScopeStatement.visit(Statements.kt:80)
	at me.senseiwells.arucas.core.Interpreter.execute(Interpreter.kt:161)
	at me.senseiwells.arucas.core.Interpreter.visitIf(Interpreter.kt:357)
	at me.senseiwells.arucas.core.Interpreter.visitIf(Interpreter.kt:20)
	at me.senseiwells.arucas.nodes.IfStatement.visit(Statements.kt:122)
	at me.senseiwells.arucas.core.Interpreter.execute(Interpreter.kt:161)
	at me.senseiwells.arucas.core.Interpreter.visitStatements(Interpreter.kt:336)
	at me.senseiwells.arucas.core.Interpreter.visitStatements(Interpreter.kt:20)
	at me.senseiwells.arucas.nodes.Statements.visit(Statements.kt:69)
	at me.senseiwells.arucas.core.Interpreter.execute(Interpreter.kt:161)
	at me.senseiwells.arucas.core.Interpreter.executeNext(Interpreter.kt:164)
	at me.senseiwells.arucas.core.Interpreter.visitScope(Interpreter.kt:340)
	at me.senseiwells.arucas.core.Interpreter.visitScope(Interpreter.kt:20)
	at me.senseiwells.arucas.nodes.ScopeStatement.visit(Statements.kt:80)
	at me.senseiwells.arucas.core.Interpreter.execute(Interpreter.kt:161)
	at me.senseiwells.arucas.core.Interpreter.visitTry(Interpreter.kt:468)
	at me.senseiwells.arucas.core.Interpreter.visitTry(Interpreter.kt:20)
	at me.senseiwells.arucas.nodes.TryStatement.visit(Statements.kt:260)
	at me.senseiwells.arucas.core.Interpreter.execute(Interpreter.kt:161)
	at me.senseiwells.arucas.core.Interpreter.visitStatements(Interpreter.kt:336)
	at me.senseiwells.arucas.core.Interpreter.visitStatements(Interpreter.kt:20)
	at me.senseiwells.arucas.nodes.Statements.visit(Statements.kt:69)
	at me.senseiwells.arucas.core.Interpreter.execute(Interpreter.kt:161)
	at me.senseiwells.arucas.core.Interpreter.executeNext(Interpreter.kt:164)
	at me.senseiwells.arucas.core.Interpreter.visitScope(Interpreter.kt:340)
	at me.senseiwells.arucas.core.Interpreter.visitScope(Interpreter.kt:20)
	at me.senseiwells.arucas.nodes.ScopeStatement.visit(Statements.kt:80)
	at me.senseiwells.arucas.core.Interpreter.execute(Interpreter.kt:161)
	at me.senseiwells.arucas.core.Interpreter.execute(Interpreter.kt:129)
	at me.senseiwells.arucas.utils.UserDefinedFunction.invoke(ArucasFunctions.kt:77)
	at me.senseiwells.arucas.utils.UserDefinedFunction.invoke(ArucasFunctions.kt:50)
	at me.senseiwells.arucas.builtin.FunctionDef.call$Arucas(FunctionDef.kt:21)
	at me.senseiwells.arucas.classes.ClassInstance.call$Arucas(ClassInstance.kt:16)
	at me.senseiwells.arucas.core.Interpreter.call(Interpreter.kt:141)
	at me.senseiwells.essentialclient.utils.clientscript.impl.ScriptEvent.lambda$invoke$0(ScriptEvent.java:54)
	at me.senseiwells.arucas.api.ThreadHandler$runAsync$1.invoke(ThreadHandler.kt:46)
	at me.senseiwells.arucas.api.ThreadHandler$runAsync$1.invoke(ThreadHandler.kt:46)
	at me.senseiwells.arucas.api.ThreadHandler$safeReturnable$1.invoke(ThreadHandler.kt:73)
	at me.senseiwells.arucas.api.ThreadHandler.unsafeAsync$lambda-3(ThreadHandler.kt:111)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at me.senseiwells.arucas.api.ThreadHandler$safe$1.invoke(ThreadHandler.kt:63)
	at me.senseiwells.arucas.api.ThreadHandler$safe$1.invoke(ThreadHandler.kt:61)
	at me.senseiwells.arucas.utils.impl.ArucasThread._init_$lambda-0(ArucasThread.kt:13)
	at java.base/java.lang.Thread.run(Thread.java:833)

```