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Fetching Resources from Project Server

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When I try executing below line of code on project server I get unknown error . Could you please help me out on this?

 projContext = new ProjectContext(pwaPath);
            
            // Get the list of enterprise resources in Project Web App.
            EnterpriseResourceCollection EnterpriseResources=projContext.EnterpriseResources;
            projContext.Load(EnterpriseResources);
            projContext.ExecuteQuery();

When I look at the stack trace I see following error message.

Exception occured in scope Microsoft.ProjectServer.EnterpriseResourceCollection._SerializeToJson. Exception=System.NullReferenceException: Object reference not set to an instance of an object.     at Microsoft.ProjectServer.CustomFieldValueBase.<>c__DisplayClass3.<get_Value>b__2(Guid id)     at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()     at System.Linq.Buffer`1..ctor(IEnumerable`1 source)     at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)     at Microsoft.ProjectServer.CustomFieldValueBase.get_Value()    at Microsoft.ProjectServer.EnterpriseResource.GetCustomFieldValue(String fieldName)     at Microsoft.SharePoint.Client.ServerStub.WriteAsJson(JsonWriter writer, Object obj, ClientObjectQuery objectQuery, ProxyContext proxyContext)    at Microsoft.SharePoint.Client.ServerStub.WriteChildItems(JsonWriter writer, Object obj, ClientObjectQuery objectQuery, ProxyContext proxyContext)     at Microsoft.SharePoint.Client.ServerStub.WriteAsJson(JsonWriter writer, Object obj, ClientObjectQuery objectQuery, ProxyContext proxyContext)     at Microsoft.SharePoint.Client.ServerStub.WriteAsJsonWithMonitoredScope(JsonWriter writer, Object value, ClientObjectQuery objectQuery, ProxyContext proxyContext)

When I try to access the webservice at ../PWA/_api/ProjectServer/EnterpriseResources

I get below error




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