Installing Service Pack for SP Designer 13, fixed the issue
https://www.microsoft.com/en-us/download/details.aspx?id=42009
Error Creating Custom Forms within the Same Site Using SharePoint Designer 2013 on SharePoint 2016 (On-Premise) Environment
Does anyone know what would cause a "Could not save list changes on server" message when attempting to create a new custom form in a SharePoint 2016 On-Premise library (default document library) but allow new custom forms in a list within the same site?
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Viswanathan, Indhumathi 1 Reputation point
2021-09-13T13:25:29.073+00:00 -
JoyZ 18,046 Reputation points
2020-12-02T05:47:39.987+00:00 Hi anonymous user-7489,
Please check whether you have broken lookup column in the default document library.
Make sure all lookup columns are hooking on existing lists.
Note: please remember to refresh SharePoint Designer if you make any changes on the document library.
Similar issue for your reference:
https://drewmadelung.com/sharepoint-designer-error-could-not-save-the-list-changes-to-the-server/
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