ข้อผิดพลาด“ ไม่สามารถรับปุ่มคืนจาก \” C \“.” หมายเลข -1728 จากปุ่มที่ส่งคืนของ“ C”

set buttonChoice to (display dialog "Play game?" buttons {"Yes", "No"} with title "Play?")
if button returned of buttonChoice = "No" then
return "No"
end if
repeat
 set levelnum to text returned of (display dialog "How many levels will you play?" buttons {"Ok"} default answer "1" with title "Levels?")
set Letters_ to {"A", "B", "C", "D", "E", "F", "G"}
set buttonChoice2 to (choose from list Letters_ with prompt "Choose A Letter" with title "Pick One" without multiple selections allowed) as text
if button returned of buttonChoice2 = "C" then
    display dialog "You Win!" buttons {"Yay!, Proceed to next level"}
    exit repeat
else
    display dialog "Try again :("
end if
end repeat

ฉันสามารถแก้ไขข้อผิดพลาด "ไม่สามารถรับปุ่มคืนเป็น \" C \ "ได้ หมายเลข -1728 จากปุ่มที่ส่งคืนของ "C"

buttonChoice2มีจดหมายที่เลือกอยู่แล้วดังนั้น

set buttonChoice2 to (choose from list Letters_ with prompt "Choose A Letter" with title "Pick One" without multiple selections allowed) as text
if buttonChoice2 = "C" then
    display dialog "You Win!" buttons {"Yay!, Proceed to next level"}
    exit repeat
else
    display dialog "Try again :("
end if