code: function ValidationError (instance) {
    NeopreneError.call(this, "Validation failed");
    Error.captureStackTrace(this, arguments.callee);
    this.name = 'ValidationError';
    this.errors = instance.errors = {};
  }
docs: Document Validation Error
  
  @api private
  @param {Document} instance
  @inherits NeopreneError