QB Issue Resolution:

Start with clicking the Reload icon beside the QBO URL, or press CTRL + F5 on your keyboard. If you’re still unable to open QBO, try doing it using a private window.

You can go back to your previous browser if you’re able to access QBO there. Then, clear the cache and restart the browser for the changes to take effect.

 

You can also switch to a different browser to access your QBO account.

Resolution for Issue 'QB shows an error message and won’t open. Does anyone know how to correct this?' available: Yes (Solved).
Source: Intuit Community forum.

QB shows an error message and won’t open. Does anyone know how to correct this?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for error message
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