diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6b2ac88..37febb4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -52,6 +52,8 @@ add_executable(App ./src/main.cpp
                    ./src/exceptions/exception400_bad_request.h
                    ./src/exceptions/exception409_conflict.cpp
                    ./src/exceptions/exception409_conflict.h
+                   ./src/exceptions/exception422_unprocessable_entity.cpp
+                   ./src/exceptions/exception422_unprocessable_entity.h
 )
 
 target_link_libraries(App PRIVATE Boost::boost Boost::json Threads::Threads mysql::concpp)
diff --git a/src/exceptions/exception422_unprocessable_entity.cpp b/src/exceptions/exception422_unprocessable_entity.cpp
new file mode 100644
index 0000000..bd9b9f6
--- /dev/null
+++ b/src/exceptions/exception422_unprocessable_entity.cpp
@@ -0,0 +1,18 @@
+#include "exception422_unprocessable_entity.h"
+
+#include <boost/beast/core/error.hpp>
+
+using namespace std;
+using namespace std::literals;
+
+namespace uad
+{
+exception422_unprocessable_entity::exception422_unprocessable_entity(const string& info): message_(info)
+{
+}
+
+char const* exception422_unprocessable_entity::what() const
+{
+  return message_.c_str();
+}
+}
diff --git a/src/exceptions/exception422_unprocessable_entity.h b/src/exceptions/exception422_unprocessable_entity.h
new file mode 100644
index 0000000..2d80b4d
--- /dev/null
+++ b/src/exceptions/exception422_unprocessable_entity.h
@@ -0,0 +1,16 @@
+#pragma once
+
+#include <exception>
+#include <string>
+
+namespace uad
+{
+struct exception422_unprocessable_entity : std::exception
+{
+private:
+  std::string message_;
+public:
+  exception422_unprocessable_entity(const std::string& info);
+  char const* what() const override;
+};
+}