diff --git a/src/Error.ts b/src/Error.ts
new file mode 100644
index 0000000..9e8bc60
--- /dev/null
+++ b/src/Error.ts
@@ -0,0 +1,40 @@
+import { Command } from "./Command.js";
+import { GuildMember } from "discord.js";
+import { Argument, ArgumentType } from "Arguments.js";
+
+export class PermissionsError extends Error {
+    private command: Command;
+    private user: GuildMember | null;
+    constructor(command: Command, user?: GuildMember | null) {
+        super();
+        this.command = command;
+        this.user = user || null;
+    }
+    toString() {
+        return `User ${this.user?.user.tag} doesn't have enough permissions to run "${this.command.name}" command`;
+    }
+}
+
+export class ArgumentTypeError extends TypeError {
+    private stringContent: string;
+    private type: ArgumentType;
+    constructor(s: string, type: ArgumentType) {
+        super();
+        this.stringContent = s;
+        this.type = type;
+    }
+    toString() {
+        `Argument ${this.stringContent} cannot be converted to ${this.type}`;
+    }
+}
+
+export class MissingArgumentError extends ReferenceError {
+    private argument: Argument;
+    constructor(a: Argument) {
+        super();
+        this.argument = a;
+    }
+    toString() {
+        return `${this.argument.name}: Argument not optional`;
+    }
+}