When I was working on a project I had to create a list instance of one of our own list definitions. I created a feature with the following element.xml.
<xml version="1.0" encoding="utf-8"> <elements xmlns="http://schemas.microsoft.com/sharepoint/"> <listinstance title="Public Navigation" description="Public Navigation List" url="Lists/NavigationPublic" templatetype="15555"> </listinstance> </elements>
When I activate this feature I got the following exception: [COMException (0x81072101): 0x81072101Cannot complete this action.
When I looked into the log files of SharePoint I found the following entries:
09/20/2010 16:11:43.49 w3wp.exe (0x1ED8) 0x1AB4 SharePoint Foundation Fields 88yt High GetUserListSchema(): Failed to get the list schema XML for feature '41202ea8-d927-475f-b710-48fe3af7e403', template '15555': hr=0x81072101. eee79fed-2362-41c1-aaa2-29b93ddee0ca
09/20/2010 16:11:43.49 w3wp.exe (0x1ED8) 0x1AB4 SharePoint Foundation General 8l2r High Failed to find the list schema for FeatureId '41202ea8-d927-475f-b710-48fe3af7e403', list template ID 15555. Cannot create list in web "http://sharepoint/sites/Test" at URL "Lists/NavigationTop". eee79fed-2362-41c1-aaa2-29b93ddee0ca 09/20/2010 16:11:43.49 w3wp.exe (0x1ED8) 0x1AB4 SharePoint Foundation General 8kh7 High 0x81072101Cannot complete this action. Please try again. eee79fed-2362-41c1-aaa2-29b93ddee0ca
This looked to me like the feature could not find the schema.xml that was defined for the list definition. I then went looking through the list instance definition and found out that I can insert a feature ID attribute. Point this feature ID attribute to the feature that installs the schema.xml and everything will go just fine.
<?xml version="1.0" encoding="utf-8"?> <Elements xmlns="http://schemas.microsoft.com/sharepoint/"> <ListInstance Title="Public Navigation" TemplateType="15555" FeatureId="aba8f789-1478-4ac7-ad36-95fceb12a23c" Url="Lists/NavigationPublic" Description="Public Navigation List" /> </Elements>