当使用AWS API Gateway调用Lambda函数时，如果出现“AWS API Gateway没有调用指定的Lambda函数”的错误，可能有以下几种解决方法：

1. 确认Lambda函数的名称和路径是否正确：检查API Gateway的集成设置，确保正确指定了要调用的Lambda函数的名称、路径和HTTP方法。

   示例代码：

   resources:
     Resources:
       MyApiGateway:
         Type: AWS::ApiGateway::RestApi
         Properties:
           Name: MyApiGateway
   
       MyLambdaFunction:
         Type: AWS::Lambda::Function
         Properties:
           FunctionName: MyLambdaFunction
           Handler: index.handler
           Runtime: nodejs14.x
           Code:
             ZipFile: |
               // Lambda function code goes here
   
       MyApiGatewayIntegration:
         Type: AWS::ApiGateway::LambdaIntegration
         Properties:
           RestApiId: !Ref MyApiGateway
           ResourceId: !GetAtt MyApiGateway.RootResourceId
           HttpMethod: POST
           IntegrationHttpMethod: POST
           IntegrationResponses:
             - StatusCode: 200
           Uri: !Sub arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:${MyLambdaFunction}/invocations
   

2. 确认访问权限是否正确设置：API Gateway需要有足够的权限来调用Lambda函数。确保为API Gateway设置了正确的IAM角色，并为该角色分配了调用Lambda函数的权限。

   示例代码：

   resources:
     Resources:
       MyApiGateway:
         Type: AWS::ApiGateway::RestApi
         Properties:
           Name: MyApiGateway
   
       MyRole:
         Type: AWS::IAM::Role
         Properties:
           RoleName: MyRole
           AssumeRolePolicyDocument:
             Version: '2012-10-17'
             Statement:
               - Effect: Allow
                 Principal:
                   Service: apigateway.amazonaws.com
                 Action: sts:AssumeRole
           Policies:
             - PolicyName: LambdaAccessPolicy
               PolicyDocument:
                 Version: '2012-10-17'
                 Statement:
                   - Effect: Allow
                     Action:
                       - lambda:InvokeFunction
                     Resource: !Sub arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:${MyLambdaFunction}
   
       MyLambdaFunction:
         Type: AWS::Lambda::Function
         Properties:
           FunctionName: MyLambdaFunction
           Handler: index.handler
           Runtime: nodejs14.x
           Code:
             ZipFile: |
               // Lambda function code goes here
   
       MyApiGatewayIntegration:
         Type: AWS::ApiGateway::LambdaIntegration
         Properties:
           RestApiId: !Ref MyApiGateway
           ResourceId: !GetAtt MyApiGateway.RootResourceId
           HttpMethod: POST
           IntegrationHttpMethod: POST
           Role: !GetAtt MyRole.Arn
           IntegrationResponses:
             - StatusCode: 200
           Uri: !Sub arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:${MyLambdaFunction}/invocations
   

3. 检查Lambda函数的日志：在AWS控制台中查看Lambda函数的日志，以了解是否有任何错误或异常。可能会显示与函数调用相关的详细信息，帮助你确定问题的根本原因。

   示例代码：

   exports.handler = async (event) => {
     console.log('Lambda function invoked');
     // Lambda function code goes here
     return {
       statusCode: 200,
       body: 'Lambda function executed successfully'
     };
   };
   

通过确认Lambda函数的名称和路径是否正确、检查访问权限是否正确设置以及检查Lambda函数的日志，你应该能够解决“AWS API Gateway没有调用指定的Lambda函数”的问题。