This error may occur if 2 or more custom fields with similar names exist on PWA. For example, this issue may occur in the following cases:
- There is a Project-Level custom field named Project id which is similar to OOB field Project Id and causes exceptions while reading OData feeds.
- There are two Resource-Level fields named Custom Field and CustomField which cause exceptions while reading OData feeds.
In order to resolve the issue rename or delete duplicate fields and force data synchronization.
In order to find duplicate field names:
- Download Duplicate Custom Field Web Part.
- Import Web Part to a page.
- Add this Web Part to a page and save the page.
- Refresh the page and check web part contents that will list all duplicate fields on PWA.
