Qt Custom Widget Failing to Build - c++

Question

I am attempting to make a custom widget/plugin to be interpreted by Qt Designer as a drag and drop element. Most works however I do get one error at the end of the build. Cannot convert argument 1 from 'QWidget *' to 'const GLineEdit &' I'm not too sure what this wants me to do to fix it, but not much is too sure. Here is my relevant source code:
GlineEditPlugin.cpp Snippet
QWidget *GLineEditPlugin::createWidget(QWidget *parent)
{
return new GLineEdit(parent);
}
GLineEdit.cpp
#include "glineedit.h"
GLineEdit::GLineEdit(const QString &str, const QString &color, QWidget *parent)
: QWidget(parent)
{
QVBoxLayout *layoutMain = new QVBoxLayout(this);
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
m_header = new GLineEditHeader(this, str);
m_header->setStyleSheet("QLabel { color: " + color + "; }");
m_input = new GLineEditInput(this);
m_input->setStyleSheet(QString("QLineEdit { font-size: 12pt; padding-bottom: 5px; border: none; background-color: transparent; border-bottom: 2px solid %1; color: %1;}").arg(color));
layoutMain->addSpacerItem(new QSpacerItem(20, 15, QSizePolicy::Minimum, QSizePolicy::Fixed));
layoutMain->addWidget(m_input);
layoutMain->setContentsMargins(0, 0, 0, 0);
layoutMain->setSpacing(0);
connect(m_input, &GLineEditInput::focusChanged, m_header, &GLineEditHeader::zoom);
connect(m_input, &GLineEditInput::cleared, m_header, &GLineEditHeader::enableZoom);
}
GLineEdit.h
#ifndef GLINEEDIT_H
#define GLINEEDIT_H
#include "glineeditheader.h"
#include "glineeditinput.h"
#include <QWidget>
#include <QVBoxLayout>
class GLineEdit : public QWidget
{
Q_OBJECT
public:
GLineEdit(const QString &str, const QString &color, QWidget *parent = 0);
QString text() const;
QString title() const;
void setText(const QString &str);
void setTitle(const QString &str);
private:
GLineEditHeader *m_header;
GLineEditInput *m_input;
};
#endif //GLINEEDIT_H

Answer 1

This is not a Minimal, Complete, and Verifiable example, and you're missing to point at the line that's failing.
However, most probably your problem can be found here:
return new GLineEdit(parent);
Your class GLineEdit doesn't provide a constructor that takes a single argument of type QWidget*, only one that accepts multiple arguments. So the compiler tries to resort to the automatically created copy constructor, which looks like
GLineEdit::GLineEdit(const GLineEdit&)
Possible solutions:
Add the missing parameters to your constructor call.
Provide a constructor that accepts a pointer to a parent widget as only parameter.