Error: Internal Error: Could not perform rigging calculations! Error:

This error message indicates that a fatal internal error has occured while performing rigging calculations. There is a variety of different strings that could be shown after the “Error: ” part. System Optimiser has multiple internal safeguards to prevent erroneous and potentially misleading information from being shown to the user. If this error is shown, please immediately report it to the System Optimiser Team (see Contact the System Optimiser Team) together with the circumstances and the configuration in which this error was generated.