Measure to filter graphs

Hi guys, 

I am trying to filter a graph using another graph. 

i got graph A, and Table B. they are both connected to a date table. 

Graph A is a bar graph and has 2 fields, ranking and new. new is just numbers, ranking{1, 2, 3} based on date. 

Table is a list of table. I want to filter so when i click on ranking 1 on the graph, it will filter the Table on Description. 
here is the code i got - im not the best powerBI user. please help.

Filtering=

VAR SelectedRanking = SELECTEDVALUE('ds_Trend'[RANKING])

var rank1 = "Materials,Diameter"

var rank2 = "Design.Max.Pressure,Design.Max.Temperature,AlternateDesign.Max.Pressure,AlternateDesign.Max.Temperature"

RETURN

SWITCH(

    SelectedRanking,

    1, CALCULATETABLE('ds_List', ds_List[DESCRIPTION] = rank1),

    2, CALCULATETABLE('ds_List', ds_List[DESCRIPTION]) =rank2,

    3, CALCULATETABLE(ds_List, NOT(ds_List[DESCRIPTION] IN {rank1, rank2}))

)

its giving me this error. 

The expression refers to multiple columns. Multiple columns cannot be converted to a scalar value.

not sure what it means.