出现这个错误的原因是AWS CDK不支持直接创建类型为SageMakerRuntime的AWS服务。解决方法是使用AWS CDK的高级功能来创建这个服务。

以下是一个使用AWS CDK创建Api网关并集成SageMaker的示例代码：

import * as cdk from 'aws-cdk-lib';
import * as apigateway from 'aws-cdk-lib/aws-apigateway';
import * as sagemaker from 'aws-cdk-lib/aws-sagemaker';

export class MyStack extends cdk.Stack {
  constructor(scope: cdk.Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    // 创建SageMaker模型
    const model = new sagemaker.CfnModel(this, 'MyModel', {
      executionRoleArn: 'YOUR_EXECUTION_ROLE_ARN',
      primaryContainer: {
        image: 'YOUR_MODEL_IMAGE',
        modelDataUrl: 'YOUR_MODEL_DATA_URL',
      },
    });

    // 创建SageMaker端点配置
    const endpointConfig = new sagemaker.CfnEndpointConfig(this, 'MyEndpointConfig', {
      productionVariants: [{
        variantName: 'MyVariant',
        modelName: model.ref,
        initialInstanceCount: 1,
        instanceType: 'ml.t2.medium',
        initialVariantWeight: 1,
      }],
    });

    // 创建SageMaker端点
    const endpoint = new sagemaker.CfnEndpoint(this, 'MyEndpoint', {
      endpointConfigName: endpointConfig.ref,
    });

    // 创建Api网关
    const api = new apigateway.RestApi(this, 'MyApi');

    // 创建Lambda集成
    const integration = new apigateway.AwsIntegration({
      service: 'sagemaker',
      integrationHttpMethod: 'POST',
      path: `endpoints/${endpoint.ref}/invocations`,
      options: {
        credentialsRole: 'YOUR_LAMBDA_ROLE_ARN',
        passthroughBehavior: apigateway.PassthroughBehavior.NEVER,
        requestTemplates: {
          'application/json': `{
            "body": $util.escapeJavaScript($input.json('$')),
            "contentType": "application/json"
          }`,
        },
        integrationResponses: [{
          statusCode: '200',
          responseTemplates: {
            'application/json': `#set($inputRoot = $input.path('$'))
            $inputRoot`,
          },
        }],
      },
    });

    // 创建资源和方法
    const resource = api.root.addResource('my-resource');
    const method = resource.addMethod('POST', integration);
  }
}

const app = new cdk.App();
new MyStack(app, 'MyStack');

在上面的示例代码中，我们首先创建了SageMaker模型、端点配置和端点。然后，我们创建了Api网关，并使用AwsIntegration类来集成SageMaker。最后，我们将资源和方法添加到Api网关。

请注意，示例代码中的一些值需要替换为您自己的值，比如YOUR_EXECUTION_ROLE_ARN、YOUR_MODEL_IMAGE、YOUR_MODEL_DATA_URL、YOUR_LAMBDA_ROLE_ARN。

希望这个示例能够帮助您解决问题！