Crash when connecting a wheel in nanocar

hello everyone, could someone help me with the configuration of nanocar?
after installing the plug-in as indicated in the following tutorial : Nanocar Builder - Avogadro 2 Plug-in by kbsezginel
“nanocar” appears well in “build”, but as soon as I select “connect wheel” I have this error:

QObject::connect: No such slot Avogadro::QtGui::InterfaceWidget::updatePreviewText() in /home/tchimoe/openchemistry/avogadrolibs/avogadro/qtgui/jsonwidget.cpp:464
QObject::connect: No such slot Avogadro::QtGui::InterfaceWidget::updatePreviewText() in /home/tchimoe/openchemistry/avogadrolibs/avogadro/qtgui/jsonwidget.cpp:457
QObject::connect: No such slot Avogadro::QtGui::InterfaceWidget::updatePreviewText() in /home/tchimoe/openchemistry/avogadrolibs/avogadro/qtgui/jsonwidget.cpp:365

after having consulted the file “Avogadro/QtGui/InterfaceWidget” I realize that the updatePreviewText() slot is not defined there, what to do in this case?

le voici…

/******************************************************************************
This source file is part of the Avogadro project.
This source code is released under the 3-Clause BSD License, (see “LICENSE”).
******************************************************************************/

#include “interfacewidget.h”

#include <avogadro/qtgui/filebrowsewidget.h>
#include <avogadro/qtgui/molecule.h>

#include <QtWidgets/QCheckBox>
#include <QtWidgets/QComboBox>
#include <QtWidgets/QDoubleSpinBox>
#include <QtWidgets/QFileDialog>
#include <QtWidgets/QFormLayout>
#include <QtWidgets/QLabel>
#include <QtWidgets/QLineEdit>
#include <QtWidgets/QMessageBox>
#include <QtWidgets/QSpinBox>
#include <QtWidgets/QTextBrowser>
#include <QtWidgets/QTextEdit>

#include <QtCore/QDebug>
#include <QtCore/QJsonArray>
#include <QtCore/QJsonDocument>
#include <QtCore/QPointer>
#include <QtCore/QSettings>
#include <QtCore/QTimer>

namespace Avogadro {
namespace QtGui {

InterfaceWidget::InterfaceWidget(const QString& scriptFilePath,
QWidget* parent_)
: JsonWidget(parent_), m_interfaceScript(QString())
{
this->setInterfaceScript(scriptFilePath);
}

InterfaceWidget::~InterfaceWidget() {}

void InterfaceWidget::setInterfaceScript(const QString& scriptFile)
{
m_interfaceScript.setScriptFilePath(scriptFile);
m_options = m_interfaceScript.options();
updateOptions();
}

void InterfaceWidget::defaultsClicked()
{
setOptionDefaults();
}

void InterfaceWidget::setWarningText(const QString& warn)
{
qWarning() << tr(“Script returns warnings:\n”) << warn;
}

QString InterfaceWidget::warningText() const
{
return QString();
}

void InterfaceWidget::showError(const QString& err)
{
qWarning() << err;

QWidget* theParent =
this->isVisible() ? this : qobject_cast<QWidget*>(parent());
QDialog dlg(theParent);
QVBoxLayout* vbox = new QVBoxLayout();
QLabel* label = new QLabel(tr(“An error has occurred:”));
vbox->addWidget(label);
QTextBrowser* textBrowser = new QTextBrowser();

// adjust the size of the text browser to ~80 char wide, ~20 lines high
QSize theSize = textBrowser->sizeHint();
QFontMetrics metrics(textBrowser->currentFont());
int charWidth = metrics.width(QStringLiteral(“i7OPlmWn9/”)) / 10;
int charHeight = metrics.lineSpacing();
theSize.setWidth(80 * charWidth);
theSize.setHeight(20 * charHeight);
textBrowser->setMinimumSize(theSize);
textBrowser->setText(err);
vbox->addWidget(textBrowser);
dlg.setLayout(vbox);

dlg.exec();
}

QString InterfaceWidget::settingsKey(const QString& identifier) const
{
return QStringLiteral(“scriptPlugin/%1/%2”)
.arg(m_interfaceScript.displayName(), identifier);
}

} // namespace QtGui
} // namespace Avogadro

It’s not actually an error - it’s a debugging warning but there’s no problem.

You mention a crash? What crashed?

Or is the problem that you’re worried about the “no such slot” messages?

thank you very much for the celerity
in the reply…
Indeed, as soon as I select “connect wheel”, the message is displayed and avogadro stops.
when i restart, it is the same scenario, after selecting “connect wheel”, avogadro2 stops…

I would like to point out that I am on an ubuntu 18.04 distribution

What version of Avogadro are you using?

Can you test a recent AppImage build? These are compiled on Ubuntu 18.04:
https://nightly.link/OpenChemistry/avogadrolibs/workflows/build_cmake/master/Avogadro2.AppImage.zip

this informations about version…
image

after bulding a new AppImage, i have a same issue, but this time with an error…

and the nwe version informations are:
image