excel - VBA Data Validation List Selection -


i'm writing code embed in 1 table. situation this: cell a1 (with option of 50,100 , 150) , cell a2 (with option of 1000 , 5000), both have data validation list in them. when choose cell a1 of 50, a2 has 1000. when wrote code , made selection, there error:

run-time error '-2147417848(80010108)': method 'add' of object 'validation' failed.

please share opinions or if need post codes here resolve issue.

the basic code following: 

select case range("a1").value case "50"          range("a2").clearcontents         range("a6").value2 = "1000"  case "`100"          range("a2").clearcontents        range("a2").validation         .delete         .add type:=xlvalidateinputonly, alertstyle:=xlvalidalertstop, operator _         :=xlbetween         .ignoreblank = true         .incelldropdown = true         .inputtitle = ""         .errortitle = ""         .inputmessage = ""         .errormessage = ""         .showinput = true         .showerror = true     end         range("a2").value2 = 1000

add code module of sheet cells want validation added 

private sub worksheet_change(byval target range)      if target.address = "$a$1"          if target.value = 50               range("a2") = 1000              ' add valid values of 1000 allowed             range("a2").validation                 .delete                 .add type:=xlvalidatelist, alertstyle:=xlvalidalertstop, operator:=xlbetween, formula1:="1000"                 .ignoreblank = true                 .incelldropdown = true                 .inputtitle = ""                 .errortitle = ""                 .inputmessage = ""                 .errormessage = "enter valid value"                 .showinput = false                 .showerror = true             end          else             ' add valid values of 1000 , 5000 allowed             range("a2").validation                 .delete                 .add type:=xlvalidatelist, alertstyle:=xlvalidalertstop, operator:=xlbetween, formula1:="1000,5000"                 .ignoreblank = true                 .incelldropdown = true                 .inputtitle = ""                 .errortitle = ""                 .inputmessage = ""                 .errormessage = "enter valid value"                 .showinput = false                 .showerror = true             end         end if         end if  end sub

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