diff --git a/core/CMakeLists.txt b/core/CMakeLists.txt
new file mode 100644
index 0000000..ad11fbc
--- /dev/null
+++ b/core/CMakeLists.txt
@@ -0,0 +1,23 @@
+cmake_minimum_required(VERSION 4.1)
+
+project(config-core LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+add_library(config-core
+        src/error.cpp)
+
+target_include_directories(config-core PUBLIC include)
+target_compile_features(config-core PUBLIC cxx_std_20)
+
+if (MSVC)
+    target_compile_options(config-core PRIVATE /W4)
+else()
+    target_compile_options(config-core PRIVATE
+            -Wall
+            -Wextra
+            -Wpedantic
+    )
+endif()
\ No newline at end of file
diff --git a/core/include/config/error.h b/core/include/config/error.h
new file mode 100644
index 0000000..ad7ac5a
--- /dev/null
+++ b/core/include/config/error.h
@@ -0,0 +1,54 @@
+#pragma once
+
+#include <cstddef>
+#include <string>
+
+namespace config {
+
+    enum class error_reason {
+        InvalidSyntax,
+        InvalidType,
+        MissingField,
+        UnknownField,
+        InvalidValue,
+        ValidationFailed,
+        InternalError
+    };
+
+    enum class error_category {
+        Parse,
+        Type,
+        Validation,
+        Internal
+    };
+
+    struct error_location {
+        std::size_t line = 0;
+        std::size_t column = 0;
+    };
+
+    class error {
+        public:
+
+        error(error_reason reason, error_category category, const std::string &message, error_location location) noexcept;
+        ~error() noexcept = default;
+
+        [[nodiscard]]
+        error_reason reason() const noexcept;
+
+        [[nodiscard]]
+        error_category category() const noexcept;
+
+        [[nodiscard]]
+        std::string message() const noexcept;
+
+        [[nodiscard]]
+        error_location location() const noexcept;
+
+        protected:
+        error_reason reason_;
+        error_category category_;
+        std::string message_;
+        error_location location_;
+    };
+}
diff --git a/core/include/config/exception.hpp b/core/include/config/exception.hpp
new file mode 100644
index 0000000..4983527
--- /dev/null
+++ b/core/include/config/exception.hpp
@@ -0,0 +1,22 @@
+#pragma once
+
+#include <stdexcept>
+#include "error.h"
+
+namespace config {
+
+    class config_exception : public std::runtime_error {
+        public:
+
+        explicit config_exception(error error)
+            : std::runtime_error(error.message().data()), error_(std::move(error)) {}
+
+        [[nodiscard]]
+        const error& original_error() const noexcept {
+            return error_;
+        }
+
+        private:
+        error error_;
+    };
+}
\ No newline at end of file
diff --git a/core/src/error.cpp b/core/src/error.cpp
new file mode 100644
index 0000000..7f766ff
--- /dev/null
+++ b/core/src/error.cpp
@@ -0,0 +1,27 @@
+#include "config/error.h"
+
+namespace config {
+
+    error::error(const error_reason reason, const error_category category, const std::string &message, const error_location location) noexcept {
+        reason_ = reason;
+        category_ = category;
+        message_ = message;
+        location_ = location;
+    }
+
+    error_reason error::reason() const noexcept {
+        return reason_;
+    }
+
+    error_category error::category() const noexcept {
+        return category_;
+    }
+
+    std::string error::message() const noexcept {
+        return message_;
+    }
+
+    error_location error::location() const noexcept {
+        return location_;
+    }
+}