QB Issue Resolution:

Don’t use the “opening” or “Beginning Balance” function at all.

Depending on which accounts, you would use a Journal Entry, or transactions, such as AP for open bills and AR for open invoices.

We don’t know how you are using Class, of course, for this file.

Resolution for Issue 'how to enter opening balances by class?' available: Yes (Solved).
Source: Intuit Community forum.

how to enter opening balances by class?: 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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