EXC_BREAKPOINT (code=1, subcode=0x18f6dd21c) error in Swift playground Xcode 13.3.1

I have written the following code as part of Swift bootcamp challenge. This code runs perfectly on Replit but when I run the code on the playground in Xcode 13.3.1 I get a huge block of error. Please help me figure out whats the error about.

var aYear =  Int(readLine()!)!

func isLeap(year: Int) {
  if year % 4 == 0 && year % 400 == 0 && year % 100 == 0 {
    print("Yes")
  } else {
    print("No")
  }
}

isLeap(year: aYear)

Here's the huge error message:

__lldb_expr_13/leapyYearusingIfElse.playground:25: Fatal error: Unexpectedly found nil while unwrapping an Optional value Playground execution failed:

error: Execution was interrupted, reason: EXC_BREAKPOINT (code=1, subcode=0x18f6dd21c). The process has been left at the point where it was interrupted, use "thread return -x" to return to the state before expression evaluation.

  • thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BREAKPOINT (code=1, subcode=0x18f6dd21c)
    • frame #0: 0x000000018f6dd21c libswiftCore.dylibclosure #1 (Swift.UnsafeBufferPointer<Swift.UInt8>) -> () in closure #1 (Swift.UnsafeBufferPointer<Swift.UInt8>) -> () in closure #1 (Swift.UnsafeBufferPointer<Swift.UInt8>) -> () in Swift._assertionFailure(_: Swift.StaticString, _: Swift.StaticString, file: Swift.StaticString, line: Swift.UInt, flags: Swift.UInt32) -> Swift.Never + 356 frame #1: 0x000000018f6dcf84 libswiftCore.dylibclosure #1 (Swift.UnsafeBufferPointer<Swift.UInt8>) -> () in closure #1 (Swift.UnsafeBufferPointer<Swift.UInt8>) -> () in Swift.assertionFailure(: Swift.StaticString, _: Swift.StaticString, file: Swift.StaticString, line: Swift.UInt, flags: Swift.UInt32) -> Swift.Never + 192 frame #2: 0x000000018f6dc954 libswiftCore.dylibSwift._assertionFailure(_: Swift.StaticString, _: Swift.StaticString, file: Swift.StaticString, line: Swift.UInt, flags: Swift.UInt32) -> Swift.Never + 228 frame #3: 0x0000000100510480 $__lldb_expr14main at leapyYearusingIfElse.playground:0 frame #4: 0x00000001000d33c8 leapyYearusingIfElselinkResources + 272 frame #5: 0x0000000180360580 CoreFoundationCFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK + 20 frame #6: 0x000000018035f854 CoreFoundation__CFRunLoopDoBlocks + 408 frame #7: 0x000000018035a018 CoreFoundation__CFRunLoopRun + 764 frame #8: 0x0000000180359804 CoreFoundationCFRunLoopRunSpecific + 572 frame #9: 0x000000018c23660c GraphicsServicesGSEventRunModal + 160 frame #10: 0x0000000184d7bd2c UIKitCore-[UIApplication _run] + 992 frame #11: 0x0000000184d808c8 UIKitCoreUIApplicationMain + 112 frame #12: 0x00000001000d3488 leapyYearusingIfElsemain + 192 frame #13: 0x00000001003b9cd8 dyld_simstart_sim + 20 frame #14: 0x0000000100309088 dyld`start + 516
How many English words
do you know?
Test your English vocabulary size, and measure
how many words do you know
Online Test
Powered by Examplum