Filter in MDX Statement

I have a very basic MDX statement which contains a FILTER statement:

WITH

SET [Selected Discipline] AS STRTOSET(@Disciplines, CONSTRAINED)
SET [Selected Department] AS STRTOSET(@Departments, CONSTRAINED)

SET [Selected Departments] AS IIF(@Disciplines = @Departments, 
  FILTER(
    DESCENDANTS([Selected Discipline], [Employee].[DISC - DEPT - EMP].[Department], AFTER), 
    NOT INSTR([Employee].[DISC - DEPT - EMP].CurrentMember.UNIQUE_NAME, "Freelance")),
  DESCENDANTS([Selected Department], [Employee].[DISC - DEPT - EMP].[Department], AFTER))

SET [TTM] AS { LastPeriods(12, StrToMember(@SelectedMonth, CONSTRAINED)) }

SELECT 

{ 
  [Measures].[Employee Hours], 
  [Measures].[Employee Hours %] 
} ON COLUMNS, 

NON EMPTY CROSSJOIN(
[Selected Departments],
[Employee].[Employee Bill Rate].[Employee Bill Rate].ALLMEMBERS,
[Employee].[Employee Level].[Employee Level].ALLMEMBERS,
[TTM]) ,

FILTER ([Employee].[Manager Name].[Manager Name].Members , 

             NOT InStr([Employee].[Manager Name].CurrentMember.MEMBER_NAME, "O-Tern"))

DIMENSION PROPERTIES MEMBER_CAPTION, MEMBER_UNIQUE_NAME ON ROWS 

FROM [OLSON BI]

WHERE (

[Employee Hours Time Category].[Time Category].&[Client Facing],
[Employee Hours Time Category].[Utilization Category].&[PRODUCTION])

CELL PROPERTIES VALUE, BACK_COLOR, FORE_COLOR, 	FORMATTED_VALUE, FORMAT_STRING, FONT

When running the query, I get the "Failed to parse the query to detect if it is mdx or dmx".

THe qqy=uery is basic enough, but for the life of me can't figure out what is wrong????

Any suggestions woud be greatly appreciated!!

Thanks

A. M. Robinson