How to use @prompt in choosing dynamic parameters

it looks like user wants to dynamically show data between two dates or two weeks or two months something like that.

I have created the objects and in the webi and made where conditions equal to those objects but been getting nothing but errors.

Below is the code, hope the explanation is clear enough

--FirstDayOfMonth
CAST(YEAR(GETDATE()) AS VARCHAR(4)) + '-' + 
CASE WHEN MONTH(GETDATE())<10 THEN '0' ELSE ' END + 
CAST(MONTH(GETDATE()) AS VARCHAR(2)) + '-01 00:00:00.001' 
 
--LastDayOfMonth
DATEADD(day,
-1,
CAST(YEAR(DATEADD(month,1,GETDATE())) AS VARCHAR(4)) + '-' + 
CASE WHEN MONTH(DATEADD(month,1,GETDATE()))<10 THEN '0' ELSE ' END + 
CAST(MONTH(DATEADD(month,1,GETDATE())) AS VARCHAR(2)) + '-01 23:59:59.998'
) 
 
 
--Prompt for Periodicity
@prompt('DatePeriods','A',{'day','week','month','quarter','year'},Mono,Constrained,Persistent)
 
 
--So the FirstPeriod object would be defined as
DATEADD(@prompt('DatePeriods','A',{'day','week','month','quarter','year'},Mono,Constrained,Persistent)
,@prompt('Num1Begin','N',,Mono,Free,Persistent), CAST(YEAR(GETDATE()) AS VARCHAR(4)) + '-' +  CASE WHEN MONTH(GETDATE())<10 THEN '0' ELSE ' END + CAST(MONTH(GETDATE()) AS VARCHAR(2)) + '-01 00:00:00.001')
 
--And the EndOfPeriod object would be defined as
DATEADD(@prompt('DatePeriods','A',{'day','week','month','quarter','year'},Mono,Constrained,Persistent)
,@prompt('Num1End','N',,Mono,Free,Persistent), DATEADD(day,-1,CAST(YEAR(DATEADD(month,1,GETDATE())) AS VARCHAR(4)) + '-' + CASE WHEN MONTH(DATEADD(month,1,GETDATE()))<10 THEN '0' ELSE ' END + CAST(MONTH(DATEADD(month,1,GETDATE())) AS VARCHAR(2)) + '-01 23:59:59.998'))

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