code: @Nonnull
    public final LoggingExceptionCallback setErrorLevel (@Nonnull final IErrorLevel aErrorLevel)
    {
      m_aErrorLevel = ValueEnforcer.notNull (aErrorLevel, "ErrorLevel");
      return this;
    }
docs: Set the error level to be used.
  
  @param aErrorLevel
  Error level to use. May not be <code>null</code>.
  @return this for chaining