[Error] Error While Importing Packages

Hello, I am new to Unity, and I got this big long error by importing a package from https://assetstore.unity.com/packages/3d/environments/sci-fi/sci-fi-styled-modular-pack-82913

Here Is The Error: NullReferenceException: Object reference not set to an instance of an object UnityEditor.PackageManager.UI.PackageList.OnListUpdate (UnityEditor.PackageManager.UI.IPage page, System.Collections.Generic.IEnumerable`1[T] addedOrUpdated, System.Collections.Generic.IEnumerable`1[T] removed, System.Boolean reorder) (at :0) UnityEditor.PackageManager.UI.PageManager+PageManagerInternal.TriggerOnPageUpdate (UnityEditor.PackageManager.UI.IPage page, System.Collections.Generic.IEnumerable`1[T] addedOrUpdated, System.Collections.Generic.IEnumerable`1[T] removed, System.Boolean reorder) (at :0) UnityEditor.PackageManager.UI.BasePage.TriggerOnListUpdate (System.Collections.Generic.IEnumerable`1[T] addOrUpdateList, System.Collections.Generic.IEnumerable`1[T] removeList, System.Boolean reorder) (at :0) UnityEditor.PackageManager.UI.PaginatedPage.OnPackagesChanged (System.Collections.Generic.IEnumerable`1[T] added, System.Collections.Generic.IEnumerable`1[T] removed, System.Collections.Generic.IEnumerable`1[T] preUpdate, System.Collections.Generic.IEnumerable`1[T] postUpdate) (at :0) UnityEditor.PackageManager.UI.PageManager+PageManagerInternal.OnPackagesChanged (System.Collections.Generic.IEnumerable`1[T] added, System.Collections.Generic.IEnumerable`1[T] removed, System.Collections.Generic.IEnumerable`1[T] preUpdate, System.Collections.Generic.IEnumerable`1[T] postUpdate) (at :0) UnityEditor.PackageManager.UI.PackageDatabase+PackageDatabaseInternal.OnPackagesChanged (System.Collections.Generic.IEnumerable`1[T] packages) (at :0) UnityEditor.PackageManager.UI.AssetStoreClient+AssetStoreClientInternal.OnLocalInfosChanged (System.Collections.Generic.IEnumerable`1[T] addedOrUpdated, System.Collections.Generic.IEnumerable`1[T] removed) (at :0) UnityEditor.PackageManager.UI.AssetStoreCache+AssetStoreCacheInternal.SetLocalInfos (System.Collections.Generic.IEnumerable`1[T] localInfos) (at :0) UnityEditor.PackageManager.UI.AssetStoreClient+AssetStoreClientInternal.RefreshLocalInfos () (at :0) UnityEditor.PackageManager.UI.AssetStoreClient+AssetStoreClientInternal.RefreshLocal () (at :0) UnityEditor.PackageManager.UI.PackageDatabase+PackageDatabaseInternal.OnDownloadFinalized (UnityEditor.PackageManager.UI.IOperation operation) (at :0) UnityEditor.PackageManager.UI.AssetStoreDownloadManager+AssetStoreDownloadManagerInternal.b__18_1 (UnityEditor.PackageManager.UI.IOperation op) (at :0) UnityEditor.PackageManager.UI.AssetStoreDownloadOperation.OnDownloadProgress (System.String message, System.UInt64 bytes, System.UInt64 total) (at :0) UnityEditor.PackageManager.UI.AssetStoreDownloadManager+AssetStoreDownloadManagerInternal.OnDownloadProgress (System.String downloadId, System.String message, System.UInt64 bytes, System.UInt64 total) (at :0)