An unexpected error has occured in "quickbooks": mainframe must be already created by now as this dll is demand loaded

This error typically occurs due to missing or corrupted QuickBooks program files. To fix this issue, follow these steps:

  1. Update QuickBooks: Ensure you are using the latest version of QuickBooks. Update your software to address any bugs or compatibility issues.
  2. Repair QuickBooks Installation: Go to the Control Panel, select “Programs and Features,” find QuickBooks, and choose the “Repair” option to fix damaged files.
  3. Reinstall QuickBooks: If the issue persists, uninstall QuickBooks completely, then reinstall it using a fresh copy of the software. Be sure to backup your company files before doing this.
  4. Run QuickBooks Tool Hub: Download and run the QuickBooks Tool Hub. Select “Program Problems” and then choose “Quick Fix my Program” to resolve this error.

If the problem continues, it might be related to a more complex issue with the system configuration. In that case, contacting QuickBooks support is recommended.