QB Issue Resolution:

Go to the Set Up Budgets window. Enter the account you created a budget for. Enter the class you used in the Class combo box. Delete the class from the combo box so that the field is again empty. Select the Apply button. Class should be removed.

Resolution for Issue 'How do I delete a budget in QB for Mac 2014?' available: Yes (Solved).
Source: Intuit Community forum.

How do I delete a budget in QB for Mac 2014?: 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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