Filter and find in angular

Angular @ViewChild() error: Expected 2 arguments, but got 1

Angular 8 , ViewChild takes 2 parameters

@ViewChild(ChildDirective, {static: false}) Component

React Warning: flattenChildren(…): Encountered two children with the same key

Its issue with map.
Add  index with some constant value rather than using

 key={value.name + value.description}

key={'some-constant-value'+index}

Error
Sharepoint 2019
Message from webpage

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soap:ServerServer was unable to process request. ---> Failed to publish workflow: <Error><CompilerError Line="-1" Column="-1" Text="Type Microsoft.SharePoint.WorkflowActions.RootWorkflowActivityWithData is not marked as authorized in the application configuration file." /><CompilerError Line="1" Column="1" Text="The root activity type is invalid." /></Error>

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Solution to this error is to add the below tag in the web app config.

  <authorizedType Assembly="System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" NameSpace="System.CodeDom" TypeName="CodeTypeReferenceExpression" Authorized="True" />