QuickBooks Error 6190 occurs when the company file is inaccessible, often due to a mismatch between the transaction log file and the company file. This error can prevent users from opening the file, typically arising in a multi-user environment. Resolving it involves verifying and rebuilding data, ensuring all users are logged out, and renaming files for consistency. Our QuickBooks Experts team can also be reached by calling 1.855.738.2784.