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SharePoint 2010: One or More Field Types are not Installed Properly. Go to the List Settings Page to Delete These Fields in Executing CAML Queries

Issue

Developer was trying to use a  CAML query and was getting this error:

"One or more field types are not installed properly. Go to the list settings page to delete these fields". 

Troubleshooting

Checked the fields and they were fine.

Executed a few other queries and found that they were working fine.

Solution

This was a clear indication that there was something wrong in the query rather than in the list settings. The query had a column "Approval Status". To verify whether it is causing the issue or not execute a small piece of code to get the internal name and check that the internal name of this field is "_ModerationStatus".

Changed the value in the query and it should work fine.

A small piece of code for reference:

SPQuery query =  new SPQuery();



String camlQuery = "<Where><Eq><FieldRef Name='_ModerationStatus'/><Value Type='Text'>Pending</Value></Eq></Where>";
 query.Query = camlQuery;
 SPListItemCollection items = list.GetItems(query);