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Have attempted to build a sticker pack for iMessage following Apple's guidelines. I have verified the sticker images are the correct dimensions, format, and well below the file size threshold. I am unable to test the sticker pack in simulator because iMessages on simulator crashes every time I attempt to build & run the sticker pack.When I build the project and run it on my physical iPhone 7 (NOT simulator) the sticker pack loads and functions perfectly.However when I try to run the project on simulator I see the icon for the project display in the lower portion of iMessage and then Imessage crashes. This crash happens on any iPhone/iPad in simulator. I receive a system error: "MobileSMS quit unexpectedly..."I am running Xcode version Version 9.0.1 (9A1004) on Mac OS High Sierra 10.13Full error report from xcode below (NOTE: I did not write or alter any code. This project only uses the default code generated byXcode for a sticker project).2017-10-24 07:29:38.368337-0700 MobileSMS[1282:60583] [Warning] Splitview controller <UISplitViewControllerClassicImpl: 0x7f9d82602cd0> is expected to have a view controller at index 0 before it's used!2017-10-24 07:29:38.443116-0700 MobileSMS[1282:60583] [MC] Loaded MobileCoreServices.framework2017-10-24 07:29:38.465400-0700 MobileSMS[1282:60583] [Application] Restoring application state. isComposingNew=NO groupID=(null)2017-10-24 07:29:38.528931-0700 MobileSMS[1282:60583] [Warning] IMBalloonPluginManager. Did not find any plugin for id com.apple.messages.browser.MorePlugin2017-10-24 07:29:38.529157-0700 MobileSMS[1282:60583] [Warning] Could not determine if com.apple.messages.browser.MorePlugin is a recent or favorite!2017-10-24 07:29:38.529278-0700 MobileSMS[1282:60583] [Warning] IMBalloonPluginManager. Did not find any plugin for id com.apple.messages.browser.MorePlugin2017-10-24 07:29:38.660833-0700 MobileSMS[1282:60583] IMSendProgress: 0x60c00046af40 (delegate: 0x7f9d82602a20, context: 0x7f9d83832400) is updating sending items from (null) to {}. (removed? 0, inserted? 0, forced? 1, hasSendingMessages? 0)2017-10-24 07:29:38.675849-0700 MobileSMS[1282:60583] +[CATransaction synchronize] called within transaction2017-10-24 07:29:38.675992-0700 MobileSMS[1282:60583] +[CATransaction synchronize] called within transaction2017-10-24 07:29:38.676141-0700 MobileSMS[1282:60583] +[CATransaction synchronize] called within transaction2017-10-24 07:29:38.684105-0700 MobileSMS[1282:60583] [Warning] Invalid parameters bundleIdentifier com.apple.ActivityMessagesApp.MessagesExtension serverBag (null)2017-10-24 07:29:38.691117-0700 MobileSMS[1282:60583] [Warning] Invalid parameters bundleIdentifier com.hifidesign.Tennis-Stickeez.StickerPackExtension serverBag (null)2017-10-24 07:29:38.693316-0700 MobileSMS[1282:60583] [Warning] Invalid parameters bundleIdentifier com.apple.siri.parsec.HashtagImagesApp.HashtagImagesExtension serverBag (null)2017-10-24 07:29:38.694145-0700 MobileSMS[1282:60583] [Warning] Invalid parameters bundleIdentifier com.hifidesign.Tennis-Anyone.StickerPackExtension serverBag (null)2017-10-24 07:29:38.695082-0700 MobileSMS[1282:60583] [Warning] Invalid parameters bundleIdentifier com.apple.icloud.apps.messages.business.extension serverBag (null)2017-10-24 07:29:38.697754-0700 MobileSMS[1282:60583] [Warning] IMBalloonPluginManager. Did not find any plugin for id com.apple.messages.browser.MorePlugin2017-10-24 07:29:38.697996-0700 MobileSMS[1282:60583] [Warning] Could not determine if com.apple.messages.browser.MorePlugin is a recent or favorite!2017-10-24 07:29:38.698350-0700 MobileSMS[1282:60583] [Warning] IMBalloonPluginManager. Did not find any plugin for id com.apple.messages.browser.MorePluginobjc[1282]: Class _MSMessageExtensionLoadingView is implemented in both /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/Messages.framework/Messages (0x136bb18c0) and /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/Messages/iMessageBalloons/MSMessageExtensionBalloonPlugin.bundle/MSMessageExtensionBalloonPlugin (0x136b7d0c8). One of the two will be used. Which one is undefined.2017-10-24 07:29:42.434946-0700 MobileSMS[1282:60583] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'attempt to scroll to invalid index path: <NSIndexPath: 0x60000022bf20> {length = 2, path = 0 - 9223372036854775807}'*** First throw call stack:( 0 CoreFoundation 0x000000010f7551cb __exceptionPreprocess + 171 1 libobjc.A.dylib 0x000000010ec71f41 objc_exception_throw + 48 2 CoreFoundation 0x000000010f7c9b95 +[NSException raise:format:] + 197 3 UIKit 0x000000010c502cd6 -[UICollectionView _contentOffsetForScrollingToItemAtIndexPath:atScrollPosition:] + 212 4 UIKit 0x000000010c50374c -[UICollectionView _scrollToItemAtIndexPath:atScrollPosition:animated:] + 70 5 ChatKit 0x000000010de01311 -[CKBrowserSwitcherViewController(XCODE_DEVELOPMENT_SUPPORT) scrollCollectionViewToPlugin:] + 240 6 ChatKit 0x000000010dd9cb0f -[CKChatInputController _launchAppExtensionForDebugging] + 682 7 CoreFoundation 0x000000010f6f107c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12 8 CoreFoundation 0x000000010f6f100f ___CFXRegistrationPost_block_invoke + 63 9 CoreFoundation 0x000000010f6f820c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12 10 CoreFoundation 0x000000010f6dca3b __CFRunLoopDoBlocks + 203 11 CoreFoundation 0x000000010f6dc83b __CFRunLoopRun + 2875 12 CoreFoundation 0x000000010f6dba89 CFRunLoopRunSpecific + 409 13 GraphicsServices 0x000000011224e9c6 GSEventRunModal + 62 14 UIKit 0x000000010ba2723c UIApplicationMain + 159 15 MobileSMS 0x000000010988b2b6 MobileSMS + 135862 16 libdyld.dylib 0x0000000110c8dd81 start + 1 17 ??? 0x0000000000000001 0x0 + 1)libc++abi.dylib: terminating with uncaught exception of type NSException