EntitySqlException: The command parameter syntax '@0' is not valid

I'm getting this error when I issue this:

DataContext.DBProjectEntities.Projects.Where(xWhere, parameterList.ToArray)

The command parameter syntax '@0' is not valid. Near line 6, column 37.

• xWhere is a string containing value "(ProjectStatuses.Any(DepartmentID = @0))"
• parameterList is Dim parameterList As New List(Of ObjectParameter)

It contains one element with value 1 of type Int32 which corresponds to the type of DepartmentID.