When QuickBooks shows Error 80070057, it means the company file couldn’t be opened correctly. This may occur due to improper firewall configurations, insufficient permissions, or outdated QuickBooks software. Start by opening QuickBooks with administrative rights and ensuring the company file path is correct. If the problem persists, try repairing QuickBooks installation using the built-in repair tool. Running QuickBooks File Doctor can also diagnose and fix related issues. These steps typically resolve the error and restore smooth access to financial data.