Issue: Convert-ToPnPPage encounters critical errors during transformation of page when using the -Folder "<root>" parameter

[Nikaedemus]

Problem Area

[ x] Page Transformation: Error during the use of page transformation from PnP PowerShell
[ ] Page Transformation: Error during the use of page transformation from .Net
[ ] Page Transformation: Page is not looking correct after transformation
[ ] Modernization Scanner: something went wrong...

Expected or Desired Behavior

We are attempting to transform a page when using a cross site transformation from an on-prem SharePoint 2016 site to a modern SharePoint Online communication site.
The page exists in the root of the source site at /[SiteName]/default.aspx and is the site home page.
We are using the cmdlet with the -Folder "" parameter. Our expected behaviour is that the page is transformed and copied to the target site 'Site Pages' library.

Observed Behavior

The operation is failing with a critical error and the error message states: "Site does not have a sitepages library and therefore this page can't be a client side page."
The target site does however have a site pages library and using the cmdlet to copy publishing pages from the source site Pages library to the target site Site Pages library has been successful.

Full Summary Report:

Modernization Summary Report

Date	Duration	Source Page	Target Page Url	Status
02/08/2024 12:08:14	00:00:01	/Diversity/default.aspx		A issue prevented successful transformation

Errors during transformation

Date	Source Page	Operation	Message
02/08/2024 12:08:15	/Diversity/default.aspx	Load	Site does not have a sitepages library and therefore this page can't be a client side page.
02/08/2024 12:08:16	/Diversity/default.aspx	Summary	A critical error occurred - transformation did not complete at PnP.Framework.Modernization.Pages.WebPartPageOnPremises.Analyze(Boolean includeTitleBarWebPart)
at PnP.Framework.Modernization.Transform.PageTransformator.Transform(PageTransformationInformation pageTransformationInformation)

Critical Errors during transformation

02/08/2024 12:08:16 - /Diversity/default.aspx

Object reference not set to an instance of an object. at PnP.Framework.Modernization.Pages.WebPartPageOnPremises.Analyze(Boolean includeTitleBarWebPart)
at PnP.Framework.Modernization.Transform.PageTransformator.Transform(PageTransformationInformation pageTransformationInformation)

Individual Page details

Transformation Details: /Diversity/default.aspx

• Report date: 02/08/2024 12:08:14
• Transform duration: 00:00:01
• Transforming from site: https://xxxx/Diversity
• Cross-Site transfer mode to site: https://xxxx.sharepoint.com/sites/INTRA-Diversity
• Transforming page: /Diversity/default.aspx
• Source SharePoint version: 2016 (16.0.0.5448)
• A critical error occurred - transformation did not complete

Page Transformation Settings

Property	Setting
Engine version	1.16.1.0
Target Page Takes Source Page Name	False
Target Page Prefix	Migrated_
Source Page Prefix	Previous_
Copy Page Metadata	False
Set Author In Page Header	False
Replace Home Page With Default Home Page	False
Overwrite	False
Target Page Name
Target Page Folder
Target Page Folder Overrides Default Folder	False
Keep Page Specific Permissions	True
Remove Empty Sections And Columns	True
Handle Wiki Images And Videos	True
Add Table List Image As Image Web Part	True
Keep Page Creation Modification Information	False
Publish Created Page	True
Post As News	False
Disable Page Comments	False
Skip Url Rewrite	False
Skip Default Url Rewrite	False
Url Mapping File
Skip Hidden Web Parts	False
Term Mapping File
Skip Term Store Mapping	False
Skip User Mapping	False
User Mapping File
L D A P Connection String
Skip Telemetry	False

Transformation Operation Details

Date	Operation	Actions Performed
02/08/2024 12:08:14	Input Validation	Page is loaded from outside a library
02/08/2024 12:08:14	Input Validation	Validation checks complete
02/08/2024 12:08:14	SharePoint Connection	Loading client context objects
02/08/2024 12:08:15	SharePoint Connection	Loading target client context object
02/08/2024 12:08:15	SharePoint Connection	Overriding 'TargetPageTakesSourcePageName' to ensure that the newly created page in the other site collection gets the same name as the source page
02/08/2024 12:08:15	Page Creation	Detect if the page is living inside a folder
02/08/2024 12:08:15	Page Creation	Just try to load the page in the fastest possible manner, we only want to see if the page exists or not
02/08/2024 12:08:15	Page Creation	Checking Page Exists
02/08/2024 12:08:15	Page Creation	Modern page created
02/08/2024 12:08:15	Home page handling	Check if the transformed page is the web's home page
02/08/2024 12:08:15	Article page handling	Transforming source page as Article page
02/08/2024 12:08:15	Article page handling	Page Header Set to None. Removing the page header
02/08/2024 12:08:15	Article page handling	Recognized source page as a Web Part Page. Analyzing web parts and page layouts

Steps to Reproduce

Source site is on-prem SP2016 site.
Source page is default.aspx in the root of the site.
Target site is a standard SharePoint Online Communication site.

Using PnP.PowerShell module v2.5.11
ConvertTo-PnPPage -Identity $PageName -TargetConnection $target -LogVerbose -Folder "" -LogType File -LogFolder c:\temp -Connection $source -ErrorAction Stop

Get-PnPException has no output.

[kstat]

@Nikaedemus This is a bit dated, but just wondering if you were able to figure out a way to make it work by any chance? We're facing the same issue with 'default.aspx' pages in SharePoint Sever 2016, and are also looking to move these to SPO.