Cannot load terrainmap

If I comment “terrainProvider: Cesium.createWorldTerrain(),” out, map will load, then I could see it properly, but I could not see a terrain map after adding the code: terrainProvider: Cesium.createWorldTerrain(), since march 2nd. Is there any issues in the version or method?

error:
Uncaught (in promise) RequestErrorEvent {statusCode: 401, response: “{"code":"InvalidCredentials","message":"Invalid access token"}”, responseHeaders: {…}}response: "{"code":"InvalidCredentials","message":"Invalid access token"}"responseHeaders: content-type: “application/json”[[Prototype]]: Objectconstructor: ƒ Object()arguments: (…)assign: ƒ assign()arguments: (…)caller: (…)length: 2name: “assign”[[Prototype]]: ƒ ()apply: ƒ apply()arguments: (…)bind: ƒ bind()call: ƒ call()caller: (…)constructor: ƒ Function()length: 0name: ""toString: ƒ toString()Symbol(Symbol.hasInstance): ƒ Symbol.hasInstanceget arguments: ƒ ()set arguments: ƒ ()get caller: ƒ ()set caller: ƒ ()[[FunctionLocation]]: ​[[Prototype]]: Object[[Scopes]]: Scopes[0][[Scopes]]: Scopes[0]caller: (…)create: ƒ create()defineProperties: ƒ defineProperties()defineProperty: ƒ defineProperty()entries: ƒ entries()freeze: ƒ freeze()fromEntries: ƒ fromEntries()getOwnPropertyDescriptor: ƒ getOwnPropertyDescriptor()getOwnPropertyDescriptors: ƒ getOwnPropertyDescriptors()getOwnPropertyNames: ƒ getOwnPropertyNames()getOwnPropertySymbols: ƒ getOwnPropertySymbols()getPrototypeOf: ƒ getPrototypeOf()is: ƒ is()isExtensible: ƒ isExtensible()isFrozen: ƒ isFrozen()isSealed: ƒ isSealed()keys: ƒ keys()length: 1name: "Object"preventExtensions: ƒ preventExtensions()prototype: {constructor: ƒ, defineGetter: ƒ, defineSetter: ƒ, hasOwnProperty: ƒ, lookupGetter: ƒ, …}seal: ƒ seal()setPrototypeOf: ƒ setPrototypeOf()values: ƒ values()[[Prototype]]: ƒ ()[[Scopes]]: Scopes[0]hasOwnProperty: ƒ hasOwnProperty()isPrototypeOf: ƒ isPrototypeOf()propertyIsEnumerable: ƒ propertyIsEnumerable()arguments: (…)caller: (…)length: 1name: “propertyIsEnumerable”[[Prototype]]: ƒ ()[[Scopes]]: Scopes[0]toLocaleString: ƒ toLocaleString()toString: ƒ toString()valueOf: ƒ valueOf()defineGetter: ƒ defineGetter()defineSetter: ƒ defineSetter()lookupGetter: ƒ lookupGetter()lookupSetter: ƒ lookupSetter()get proto: ƒ proto()set proto: ƒ proto()statusCode: 401[[Prototype]]: ObjecttoString: ƒ ()constructor: ƒ RequestErrorEvent(statusCode, response, responseHeaders)[[Prototype]]: Object

Sorry this was just wrong with the version. It worked fine after I updated the version of Cesium. Thank you.