QB Issue Resolution:

The error code (-6000, -77) could be mean of two things: Network or Data Issue

For case isolation, open the file locally. If you can open the file locally, then it must be a network issue. Restart the computer to where the file is and access the file on the network (observe if the same error would surface).

If the file is located only on a single PC, consider running verify to the file (File > Utilities > Verify Data).

Resolution for Issue 'What is error code (-6000, -77)? I’m using the QB2013 Pro version' available: Yes (Solved).
Source: Intuit Community forum.

What is error code (-6000, -77)? I’m using the QB2013 Pro version: 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.

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