Driver not loaded Driver not loaded

[Hughen]

I added this code：

QString strLibPath(QDir::toNativeSeparators(QApplication::applicationDirPath()) + QDir::separator() + "plugins");
app.addLibraryPath(strLibPath);

QString strLibPath(QDir::toNativeSeparators(QApplication::applicationDirPath()) + QDir::separator() + "plugins");
app.addLibraryPath(strLibPath);

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but there has the problem.
What should I do??