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

[kb_barge]

I want to show last year store count based on from date and to date .Getting the following error :The expression refers to multiple columns .Multiple columns cannot be converted to scalar value.

LastYearStoreCount =

VAR lastFromDate =

SELECTEDVALUE(WUSA_VIEW[From_Date1], TODAY()) - 364

VAR lastToDate = SELECTEDVALUE(WUSA_VIEW[To_Date1], TODAY()) - 364

RETURN

IF([DateDiff] > 365, 0, IF( FILTER(ALL(WUSA_CAL_DIM),

WUSA_CAL_DIM[End_Date] >= lastFromDate && WUSA_CAL_DIM[End_Date] <= lastToDate),DISTINCTCOUNT(WUSA_STORE_DIM[Store Code])

))

[tex628]

LastYearStoreCount =
VAR lastFromDate =
SELECTEDVALUE(WUSA_VIEW[From_Date1], TODAY()) - 364
VAR lastToDate = SELECTEDVALUE(WUSA_VIEW[To_Date1], TODAY()) - 364
RETURN
IF([DateDiff] > 365, 0, 
IF( FILTER(ALL(WUSA_CAL_DIM), WUSA_CAL_DIM[End_Date] >= lastFromDate && WUSA_CAL_DIM[End_Date] <= lastToDate),DISTINCTCOUNT(WUSA_STORE_DIM[Store Code])
))

There is something wrong in the final if statement. Your filter statement is covering the entire if so there is no actual comparison happening. 
I think what you actually need is a calculate statement instead of the if statement:

CALCULATE(
DISTINCTCOUNT(WUSA_STORE_DIM[Store Code]),
ALL(WUSA_CAL_DIM),
WUSA_CAL_DIM[End_Date] >= lastFromDate,
WUSA_CAL_DIM[End_Date] <= lastToDate
)