Is any error in my query?

Question

Hello friends
 This is my store procedure
create procedure sp_excelforgeneralholidays(@filname nvarchar(max))
 as 
 declare @datavar varchar(200)
 declare @sql varchar(500)
 set @datavar  = 'Excel 8.0;DATABASE=' + @filname
 
 set nocount on
  begin
  --create table #temptable (Date date ,Day varchar(30),Reason varchar(100))
  set @sql = INSERT INTO Genaral_holydays_details(Date,Day,Reason) SELECT Date,Day,Reason  FROM OPENROWSET('Microsoft.jet.OLEDB.4.0','+@datavar +;HDR=YES','SELECT Data,Day,Reason FROM [Sheet1$]')
 
  exec (@sql)
 end

and the excution part is
 exec sp_excelforgeneralholidays'D:\baskaran\baskarbook1'


The error is  incorrect syntax near INSERT