diff --git a/libs/ui/KisImportExportErrorCode.h b/libs/ui/KisImportExportErrorCode.h
index 7f9f5d0e02..dda02c6b15 100644
--- a/libs/ui/KisImportExportErrorCode.h
+++ b/libs/ui/KisImportExportErrorCode.h
@@ -1,163 +1,163 @@
 /*
  *  Copyright (c) 2019 Agata Cacko <cacko.azh@gmail.com>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 #ifndef KIS_IMPORT_EXPORT_ERROR_CODES_H
 #define KIS_IMPORT_EXPORT_ERROR_CODES_H
 
 
 #include <QFile>
 #include <QFileDevice>
 #include <QString>
 #include <kritaui_export.h>
 #include <QDebug>
 
 
 namespace ImportExportCodes
 {
 
     enum KRITAUI_EXPORT ErrorCodeID
     {
         InternalError, // error that shouldn't happen; only inside ASSERTS
 
         // Reading
         FileNotExist, // there is no file with that name in that location,
         NoAccessToRead, // Krita has no reading access to the file,
         ErrorWhileReading, // there was an error that occured during reading,
         FileFormatIncorrect, // file format cannot be parsed,
         FormatFeaturesUnsupported, // file format can be parsed, but some features are unsupported,
         FormatColorSpaceUnsupported, // file format can be parsed, but color space of the image is unsupported
 
 
         // Writing
         CannotCreateFile, // file cannot be created
         NoAccessToWrite, // Krita has no writing access to the file
         ErrorWhileWriting, // there was an error that occured during writing (can be insufficient memory, too, just we don't know)
         InsufficientMemory, // there is not enough memory left
 
         // Both
         Cancelled, // cancelled by a user
 
         // Other
         Failure, // unspecified error
 
         // OK
         OK, // everything went ok
 
     };
 
 };
 
 
-struct KisImportExportErrorCode;
+class KisImportExportErrorCode;
 
 struct KRITAUI_EXPORT KisImportExportComplexError
 {
     virtual QString errorMessage() const = 0;
     KisImportExportComplexError(QFileDevice::FileError error);
 
     friend QDebug operator<<(QDebug d, const KisImportExportErrorCode& errorCode);
 
 
 protected:
     QString qtErrorMessage() const;
     QFileDevice::FileError m_error;
     virtual ~KisImportExportComplexError() {}
 };
 
 struct KRITAUI_EXPORT KisImportExportErrorCannotWrite : KisImportExportComplexError
 {
 
     KisImportExportErrorCannotWrite(QFileDevice::FileError error);
     QString errorMessage() const override;
 
     ~KisImportExportErrorCannotWrite() { }
 
     bool operator==(KisImportExportErrorCannotWrite other);
 
 private:
     KisImportExportErrorCannotWrite();
 
     //friend KisImportExportErrorCode::KisImportExportErrorCode(KisImportExportErrorCannotWrite code);
     friend class KisImportExportErrorCode;
 
 };
 
 struct KRITAUI_EXPORT KisImportExportErrorCannotRead : KisImportExportComplexError
 {
 
     KisImportExportErrorCannotRead(QFileDevice::FileError error);
     QString errorMessage() const override;
 
     ~KisImportExportErrorCannotRead() { }
 
     bool operator==(KisImportExportErrorCannotRead other);
 
 private:
     KisImportExportErrorCannotRead();
 
     //friend KisImportExportErrorCode::KisImportExportErrorCode(KisImportExportErrorCannotRead code);
     friend class KisImportExportErrorCode;
 
 };
 
 
 
-struct KRITAUI_EXPORT KisImportExportErrorCode
+class KRITAUI_EXPORT KisImportExportErrorCode
 {
 public:
     // required by kis_async_action_feedback
     KisImportExportErrorCode();
 
     KisImportExportErrorCode(ImportExportCodes::ErrorCodeID code);
     KisImportExportErrorCode(KisImportExportErrorCannotRead code);
     KisImportExportErrorCode(KisImportExportErrorCannotWrite code);
 
     QString errorMessage() const;
     bool isOk() const;
     bool isCancelled() const;
     bool isInternalError() const;
 
     friend QDebug operator<<(QDebug d, const KisImportExportErrorCode& errorCode);
 
     bool operator==(KisImportExportErrorCode errorCode);
 
 private:
     enum ErrorFieldUsed
     {
         None,
         CodeId,
         CannotRead,
         CannotWrite
     };
 
     ErrorFieldUsed errorFieldUsed;
 
     ImportExportCodes::ErrorCodeID codeId;
     KisImportExportErrorCannotRead cannotRead;
     KisImportExportErrorCannotWrite cannotWrite;
 };
 
 
 
 
 
 
 KRITAUI_EXPORT QDebug operator<<(QDebug d, const KisImportExportErrorCode& errorCode);
 
 #endif // KIS_IMPORT_EXPORT_ERROR_CODES_H