问总是在aws中获取stack.regionalFact错误。

EN

D:\Unicorn\cdk\step03_graphQl\node_modules\@aws-cdk\aws-iam\lib\principals.ts:775
    return stack.regionalFact(
                 ^
TypeError: Resolution error: Resolution error: Resolution error: Resolution error: stack.regionalFact is not a function.
Object creation stack:
  at stack traces disabled.
Object creation stack:
  at stack traces disabled..
    at ServicePrincipalToken.resolve (D:\Unicorn\cdk\step03_graphQl\node_modules\@aws-cdk\aws-iam\lib\principals.ts:775:18)
    at RememberingTokenResolver.resolveToken (D:\Unicorn\cdk\step03_graphQl\node_modules\@aws-cdk\core\lib\resolvable.ts:80:24)
    at RememberingTokenResolver.resolveToken (D:\Unicorn\cdk\step03_graphQl\node_modules\@aws-cdk\core\lib\private\resolve.ts:286:18)
    at resolve (D:\Unicorn\cdk\step03_graphQl\node_modules\@aws-cdk\core\lib\private\resolve.ts:212:51)
    at Object.resolve [as mapToken] (D:\Unicorn\cdk\step03_graphQl\node_modules\@aws-cdk\core\lib\private\resolve.ts:119:77)
    at TokenizedStringFragments.mapTokens (D:\Unicorn\cdk\step03_graphQl\node_modules\@aws-cdk\core\lib\string-fragments.ts:65:33)
    at RememberingTokenResolver.resolveString (D:\Unicorn\cdk\step03_graphQl\node_modules\@aws-cdk\core\lib\resolvable.ts:99:22)
    at RememberingTokenResolver.resolveString (D:\Unicorn\cdk\step03_graphQl\node_modules\@aws-cdk\core\lib\private\resolve.ts:290:23)
    at resolve (D:\Unicorn\cdk\step03_graphQl\node_modules\@aws-cdk\core\lib\private\resolve.ts:170:48)
    at Object.resolve (D:\Unicorn\cdk\step03_graphQl\node_modules\@aws-cdk\core\lib\private\resolve.ts:119:77)
Subprocess exited with error 1

const lambda_function = new lambda.Function(this, "LambdaFucntion", {
  runtime: lambda.Runtime.NODEJS_14_X, ///set nodejs runtime environment
  code: lambda.Code.fromAsset("lambda"), ///path for lambda function directory
  handler: "index.handler", ///specfic fucntion in specific file
  // timeout: cdk.Duration.seconds(10), ///Time for function to break. limit upto 15 mins
});