QuickBooks blunder code C=51 shows that the QuickBooks programming can’t track down the TxList. This error can also be seen when the user tries to remove the TxList from the list of TxLists, but unable to spot it. Such an error is also seen when the user makes an attempt to remove a transaction from any report. When the user faces this type of issue, the user needs to shut down this application. Shutting all windows including QuickBooks and afterward reboot it once more.