Help implementing graphics classes

[tfarmer4]

Node *node;
node->setText(QObject::tr("Node %1").arg(seqNumber +1));

Node *node;
node->setText(QObject::tr("Node %1").arg(seqNumber +1));

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This is wrong and will crash. You need to initialise node first.
Node *node = new Node;

If i try to initialize *node, I get an error that says invalid use of incomplete type Node.