The TFS Query object is used to run queries stored on the TFS Server. When this class is instantitated, the constructor requires two or more parameters named WorkItemStore and WIQL text. The WIQL text can be navigated to using the QueryFolder and QueryDefinition for 'Shared queries' folder and the name of the query respectively and using the QueryText property on the QueryDefinition. However if the WIQL text has a reference to variables such as '@Project' it throws the TFS Error. Ok. That had to do with wrapping constants in quotes and TFS permissions and this is now automated.