Error 61 QuickBooks occurs due to different reasons such as .QBW file is damage, a corrupted .ND or .TLG file or your system is infected with virus or malware. You can resolve QuickBooks error 61 in different ways. Firstly, launch QuickBooks, go to the File tab, click utilities, and hit rebuild data. If a dialogue box appears saying backup your company file, click ok. Once the rebuild has completed notification message appears on the screen, click ok and the problem should be resolved. You may also try updating the company file to a new version in order to avoid such errors in the future.