diff --git a/build/error/core/Err.php b/build/error/core/Err.php
new file mode 100755
index 0000000..449733e
--- /dev/null
+++ b/build/error/core/Err.php
@@ -0,0 +1,112 @@
+<?php
+
+
+	namespace error\core;
+
+
+	class Err{
+		/* [1] Success
+		=========================================================*/
+			const Success             = 0;
+
+
+		/* [2] Fichiers / Ressources
+		=========================================================*/
+			/* (1) Parsage json/xml */
+			const ParsingFailed       = 1;
+			/* (2) Fichier inexistant */
+			const UnreachableResource = 2;
+			/* (3) Erreur d'upload */
+			const UploadError         = 3;
+			/* (4) Mauvais format de fichier */
+			const FormatError         = 4;
+
+
+		/* [3] Permissions
+		=========================================================*/
+			/* (1) Token inexistant ou incorrect */
+			const TokenError          = 5;
+			/* (2) Permission non autorisée */
+			const PermissionError     = 6;
+
+
+
+
+		/* [4] API
+		=========================================================*/
+			/* (1) Le module n'est pas activé */
+			const DisabledModule      = 7;
+
+			/* (2) Le @path n'est pas renseigne */
+			const MissingPath         = 8;
+			/* (3) Verification de la coherence du chemin (existe dans la conf) */
+			const WrongPathModule     = 9;
+
+			/* (4) Module non specifie dans la conf */
+			const UnknownModule       = 10;
+			/* (5) Methode non specifie pour ce Module dans la conf */
+			const UnknownMethod       = 11;
+
+			/* (6) Module non amorcable */
+			const UncallableModule    = 12;
+			/* (7) Methode non amorcable */
+			const UncallableMethod    = 13;
+
+			/* (8) Erreur méthode HTTP */
+			const UnknownHttpMethod   = 14;
+
+			/* (9) Erreur de configuration */
+			const ConfigError         = 15;
+			/* (10) Paramètre manquant */
+			const MissingParam        = 16;
+			/* (11) Paramètre incorrect */
+			const WrongParam          = 17;
+			/* (12) Erreur dans le traitement */
+			const ModuleError         = 18;
+
+
+		/* [5] Database
+		=========================================================*/
+		/* (1) Base de données
+		---------------------------------------------------------*/
+			/* (1) Erreur lors de la creation d'un objet PDO (connection) */
+			const PDOConnection       = 19;
+
+		/* (2) Repositories
+		---------------------------------------------------------*/
+			/* (1) Verification de la coherence du chemin (existe dans la conf) */
+			const WrongPathRepo       = 20;
+
+			/* (2) Module non specifie dans la conf */
+			const UnknownRepo         = 21;
+
+			/* (3) Erreur dans le traitement */
+			const RepoError           = 22;
+
+		/* (3) ORM
+		---------------------------------------------------------*/
+			/* (1) Table n'existe pas */
+			const UnknownTable        = 23;
+			/* (2) Pas permissions de lire le schéma */
+			const NotAllowedSchema    = 24;
+
+
+		/* [6] Erreurs diverses
+		=========================================================*/
+			/* (1) Aucune donnée trouvée */
+			const NoMatchFound        = 25;
+
+			/* (2) Mauvais chemin de template */
+			const UnknownTemplate     = 26;
+
+			/* (3) géolocalisation échouée */
+			const UnknownAddress      = 27;
+
+			/* (4) Erreur inconnue */
+			const UnknownError        = 28;
+
+			/* (5) Entrée existante */
+			const AlreadyExists       = 29;
+	}
+
+?>
diff --git a/build/error/core/Error.php b/build/error/core/Error.php
new file mode 100755
index 0000000..9d2d2d0
--- /dev/null
+++ b/build/error/core/Error.php
@@ -0,0 +1,197 @@
+<?php
+
+
+	namespace error\core;
+
+	use \error\core\Err;
+
+	class Error{
+
+		private $error     = null;
+		private $arguments = [];
+
+		/* ERROR CONSTRUCTOR
+		*
+		* @error<const> 										Const error
+		* @arg1<String>											[OPT] Argument 1
+		* @arg2<String>											[OPT] Argument 2
+		* @arg...<String>										[OPT] Argument ...
+		*
+		* @return instance<Error> 								Error instance
+		*
+		*/
+		public function __construct($const){
+			call_user_func_array([$this, 'set'], func_get_args());
+		}
+
+		/* ERROR GETTER
+		*
+		* @return Err<Err::Constant> 					Error
+		*
+		*/
+		public function get(){ return $this->error; }
+
+		/* ERROR SETTER
+		*
+		* @error<const> 										Const error
+		* @arg1<String>											[OPT] Argument 1
+		* @arg2<String>											[OPT] Argument 2
+		* @arg...<String>										[OPT] Argument ...
+		*
+		* @return instance<Error> 								Error instance
+		*
+		*/
+		public function set($const){
+			/* [1] On découpe les arguments
+			=========================================================*/
+			/* (1) On récupère l'erreur */
+			$this->error = !is_numeric($const) ? Err::UnknownError : $const;
+
+			/* (2) On récupère les arguments */
+			$this->arguments = array_slice(func_get_args(), 1);
+		}
+
+
+		/* EXPLICITE UN CODE D'ERREUR
+		*
+		* @return explicit<String> 							Description explicite du code d'erreur
+		*
+		*/
+		public function explicit(){
+			switch($this->error){
+				case Err::Success:             return $this->Success();             break;
+				case Err::ParsingFailed:       return $this->ParsingFailed();       break;
+				case Err::UnreachableResource: return $this->UnreachableResource(); break;
+				case Err::UploadError:         return $this->UploadError();         break;
+				case Err::FormatError:         return $this->FormatError();         break;
+				case Err::TokenError:          return $this->TokenError();          break;
+				case Err::PermissionError:     return $this->PermissionError();     break;
+				case Err::DisabledModule:      return $this->DisabledModule();      break;
+				case Err::MissingPath:         return $this->MissingPath();         break;
+				case Err::WrongPathModule:     return $this->WrongPathModule();     break;
+				case Err::UnknownModule:       return $this->UnknownModule();       break;
+				case Err::UnknownMethod:       return $this->UnknownMethod();       break;
+				case Err::UncallableModule:    return $this->UncallableModule();    break;
+				case Err::UncallableMethod:    return $this->UncallableMethod();    break;
+				case Err::UnknownHttpMethod:   return $this->UnknownHttpMethod();   break;
+				case Err::ConfigError:         return $this->ConfigError();        break;
+				case Err::MissingParam:        return $this->MissingParam();        break;
+				case Err::WrongParam:          return $this->WrongParam();          break;
+				case Err::ModuleError:         return $this->ModuleError();         break;
+				case Err::PDOConnection:       return $this->PDOConnection();       break;
+				case Err::WrongPathRepo:       return $this->WrongPathRepo();       break;
+				case Err::UnknownRepo:         return $this->UnknownRepo();         break;
+				case Err::RepoError:           return $this->RepoError();           break;
+				case Err::UnknownTable:        return $this->UnknownTable();        break;
+				case Err::NotAllowedSchema:    return $this->NotAllowedSchema();    break;
+				case Err::NoMatchFound:        return $this->NoMatchFound();        break;
+				case Err::UnknownTemplate:     return $this->UnknownTemplate();     break;
+				case Err::UnknownAddress:      return $this->UnknownAddress();      break;
+				case Err::UnknownError:        return $this->UnknownError();        break;
+				case Err::AlreadyExists:       return $this->AlreadyExists();       break;
+
+				default:                       return $this->UnknownDebugError();   break;
+			}
+		}
+
+
+		private function Success(){
+			return 'all right';
+		}private function ParsingFailed(){
+			if(	count($this->arguments) > 0 )
+				return $this->arguments[0].' parsing failed';
+			else
+				return 'parsing failed';
+		}private function UnreachableResource(){
+			return 'unreachable resource';
+		}private function UploadError(){
+			return 'upload error';
+		}private function FormatError(){
+			return 'format error';
+		}private function TokenError(){
+			return 'bad or expired token';
+		}private function PermissionError(){
+			if(	count($this->arguments) > 0 )
+				return "missing permission: '".$this->arguments[0]."'";
+			else
+				return 'permission error';
+		}private function DisabledModule(){
+			return 'disabled module';
+		}private function MissingPath(){
+			return 'missing path';
+		}private function WrongPathModule(){
+			return 'wrong module\'s path';
+		}private function UnknownModule(){
+			if(	count($this->arguments) > 0 )
+				return 'unknown module \''.$this->arguments[0].'\'';
+			else
+				return 'unknown module';
+		}private function UnknownMethod(){
+			if(	count($this->arguments) > 0 )
+				return 'unknown method \''.$this->arguments[0].'\'';
+			else
+				return 'unknown method';
+		}private function UncallableModule(){
+			if(	count($this->arguments) > 0 )
+				return 'uncallable module \''.$this->arguments[0].'\'';
+			else
+				return 'uncallable module';
+		}private function UncallableMethod(){
+			if(	count($this->arguments) > 0 )
+				return 'uncallable method \''.$this->arguments[0].'\'';
+			else
+				return 'uncallable method';
+		}private function UnknownHttpMethod(){
+			return 'unknown HTTP method';
+		}private function ConfigError(){
+			return 'configuration error';
+		}private function MissingParam(){
+			if(	count($this->arguments) > 0 )
+				return 'missing param \''.$this->arguments[0].'\'';
+			else
+				return 'missing param';
+		}private function WrongParam(){
+			if(	count($this->arguments) > 0 )
+				if(	count($this->arguments) > 1 )
+					return 'wrong param \''.$this->arguments[0].'\' expected to be of type \''.$this->arguments[1].'\'';
+				else
+					return 'wrong param \''.$this->arguments[0].'\'';
+			else
+				return 'wrong param';
+		}private function ModuleError(){
+			return 'module error';
+		}private function PDOConnection(){
+			return 'database error';
+		}private function WrongPathRepo(){
+			return 'wrong repository\'s path';
+		}private function UnknownRepo(){
+			return 'unknown repository';
+		}private function RepoError(){
+			return 'repository error';
+		}private function UnknownTable(){
+			return 'unknown table';
+		}private function NotAllowedSchema(){
+			return 'schema browsing not allowed';
+		}private function NoMatchFound(){
+			return 'no match found';
+		}private function UnknownTemplate(){
+			return 'unknown template';
+		}private function UnknownAddress(){
+			return 'unknown';
+		}private function UnknownError(){
+			return 'unknown error';
+		}private function AlreadyExists(){
+			return 'item already exists';
+		}private function UnknownDebugError(){
+			return 'unknown debug error';
+		}
+
+
+		public function setHttpCode(){
+			http_response_code( $this->error == Err::Success ? 200 : 417 );
+		}
+
+	}
+
+
+?>