Qt中的c++错误:有初始化但不完整的类型。

void FindWords::getTextFile() {
    QFile myFile(":/FindingWords2.txt");
    myFile.open(QIODevice::ReadOnly);

    QTextStream textStream(&myFile);
    QString line = textStream.readAll();
    myFile.close();

    ui->textEdit->setPlainText(line);
    QTextCursor textCursor = ui->textEdit->textCursor();
    textCursor.movePosition(QTextCursor::Start, QTextCursor::MoveAnchor, 1);
}
void FindWords::getTextFile() {
    QFile myFil