This line appears on the top of my new header file for a project

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I don't know what that is, it just appeared on my newly created header file for a project. it has red line under it. when I hover my mouse over, it displayed expected a declaration.

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also appared on my newly created cpp file that defines my header file.

at first, I just simply delete these undefined rubish. however, I can't get my project to compile. It produced bunch of errors.

stray '\377' in program
stray '\376' in program
stray '#' in program

lots of null character ignored

the following is my code for the header file

#ifndef FindDialog_h
#define FindDialog_h
 
#include <Qdialog>
 
class QCheckBox;
class QLabel;
class QLineEdit;
class QPushButton;
 
class FindDialog : public QDialog
{
    Q_OBJECT
 
public:
    FindDialog(QWidget *parent = 0);
 
signals:
    void findNext(const QString &str, Qt::CaseSensitivity cs);
    void findPrevious(const QString &str, Qt::CaseSensitivity cs);
 
private slots:
    void findClicked();
    void enableFindButton(const QString &text);
 
private:
    QLabel *label;
    QLineEdit *lineEdit;
    QCheckBox *caseCheckBox;
    QCheckBox *backwardCheckBox;
    QPushButton *findButton;
    QPushButton *closeButton;
};
 
#endif

#ifndef FindDialog_h
#define FindDialog_h

#include <Qdialog>

class QCheckBox;
class QLabel;
class QLineEdit;
class QPushButton;

class FindDialog : public QDialog
{
    Q_OBJECT

public:
    FindDialog(QWidget *parent = 0);

signals:
    void findNext(const QString &str, Qt::CaseSensitivity cs);
    void findPrevious(const QString &str, Qt::CaseSensitivity cs);

private slots:
    void findClicked();
    void enableFindButton(const QString &text);

private:
    QLabel *label;
    QLineEdit *lineEdit;
    QCheckBox *caseCheckBox;
    QCheckBox *backwardCheckBox;
    QPushButton *findButton;
    QPushButton *closeButton;
};

#endif

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I deleted the rubish at the begining

[Lykurg]

It's

#include <QDialog>

#include <QDialog>

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but that's probably just a typo. make sure you have deleted all the rubbish and that there is no invisible rest. Also make sure you set the right text encoding. Do you use Qt Creator?