# Chapter 1, Page 30 and XCode 9.3 **URL:** \ **Category:** Advanced Apple Debugging\ **Created:** [May 8, 2018, 10:44am UTC](https://forums.kodeco.com/t/chapter-1-page-30-and-xcode-9-3/42376 "2018-05-08T10:44:11Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![tetanuss](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/tetanuss/32/81494_2.png) [@tetanuss](https://forums.kodeco.com/u/tetanuss)\ **Post date:** [May 8, 2018, 10:44am UTC](https://forums.kodeco.com/t/chapter-1-page-30-and-xcode-9-3/42376/1 "2018-05-08T10:44:11Z")
the line (lldb) breakpoint modify 1 -c ‘(BOOL)[$rdi isKindOfClass: (id)NSClassFromString(@“IDEPegasusSourceEditor.SourceCodeEditorView”)]’ did not work in my case - just a flashing out in the console which I could not read I changed the line in (lldb) breakpoint modify 1 -c ‘(BOOL)[$rdi isKindOfClass:(id)NSClassFromString(@“SourceEditor.SourceEditorView”)]’ And everything works again. I’m pretty sure that I used this version with IDEPegasus… before and I guess there’s an API change. ---
**Author:** ![shogunkaramazov](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/shogunkaramazov/32/108826_2.png) [@shogunkaramazov](https://forums.kodeco.com/u/shogunkaramazov)\ **Post date:** [May 29, 2018, 11:10pm UTC](https://forums.kodeco.com/t/chapter-1-page-30-and-xcode-9-3/42376/2 "2018-05-29T23:10:10Z")
@lolgrep Do you have any feedback regarding this? Thank you - much appreciated! :] ---
**Author:** ![kush131](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/kush131/32/98620_2.png) [@kush131](https://forums.kodeco.com/u/kush131)\ **Post date:** [June 6, 2018, 7:22pm UTC](https://forums.kodeco.com/t/chapter-1-page-30-and-xcode-9-3/42376/3 "2018-06-06T19:22:55Z")
Can confirm that @tetanuss solution works for me as well. Curiously enough, when I tried to do the query for Swift frameworks a few pages back I got back this list: Xcode DVTFoundation DVTKit IDEFoundation IDEKit libswiftAVFoundation.dylib libswiftCore.dylib libswiftCoreAudio.dylib libswiftCoreFoundation.dylib libswiftCoreGraphics.dylib libswiftCoreMedia.dylib libswiftDarwin.dylib libswiftDispatch.dylib libswiftFoundation.dylib libswiftObjectiveC.dylib libswiftQuartzCore.dylib libswiftsimd.dylib libswiftAppKit.dylib libswiftCoreData.dylib libswiftos.dylib SourceKit DVTAnalytics DVTDocumentation DNTDocumentationModel DNTDocumentationSupport DVTSourceControl DNTSourceKitSupport DVTSourceControlHostedAccount DVTAnalyticsClient DNTTransformer IDEProducts SimulatorKit libswiftAccelerate.dylib IDESourceCodeComparisonEditor IDESourceEditor SourceEditor MarkupSupport SourceKitSupport SourceModelSupport DVTSourceEditor DVTMarkup IDESourceControlUI IDEProductsUI IDEDocViewer GPURenderTargetEditor IDESceneKitEditor IDEPlaygroundEditor IDEPegasusPlaygroundEditor XCSCore XCSUI XCSAdministration libswiftSwiftOnoneSupport.dylib SwiftProtobuf XCBuildSupport XCBuild XCBProtocol XCBUtil IDEQuickHelp Which does not include IDEPegasusSourceEditor. Did a recent Xcode update change things? ---
**Author:** ![fclement](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/fclement/32/81494_2.png) [@fclement](https://forums.kodeco.com/u/fclement)\ **Post date:** [June 11, 2018, 2:20pm UTC](https://forums.kodeco.com/t/chapter-1-page-30-and-xcode-9-3/42376/4 "2018-06-11T14:20:19Z")
For Xcode 9.4, replace: (lldb) breakpoint modify 1 -c ‘(BOOL)[$rdi isKindOfClass: (id)NSClassFromString(@“IDEPegasusSourceEditor.SourceCodeEditorView”)]’ By: (lldb) breakpoint modify 1 -c ‘(BOOL)[$rdi isKindOfClass: (id)NSClassFromString(@“IDESourceEditor.IDESourceEditorView”)]’ ---
**Author:** ![shogunkaramazov](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/shogunkaramazov/32/108826_2.png) [@shogunkaramazov](https://forums.kodeco.com/u/shogunkaramazov)\ **Post date:** [June 29, 2018, 2:40pm UTC](https://forums.kodeco.com/t/chapter-1-page-30-and-xcode-9-3/42376/5 "2018-06-29T14:40:27Z")
@lolgrep Can you please help with this when you get a chance? Thank you - much appreciated! :] ---
**Author:** ![lolgrep](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/lolgrep/32/106950_2.png) [@lolgrep](https://forums.kodeco.com/u/lolgrep)\ **Post date:** [July 12, 2018, 11:01pm UTC](https://forums.kodeco.com/t/chapter-1-page-30-and-xcode-9-3/42376/6 "2018-07-12T23:01:17Z")
Yes, they’ve been busy in changing stuff around. I’ll probably be replacing this chapter since this area is too “hot” and too many changes are happening ---
**Author:** ![tetanuss](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/tetanuss/32/81494_2.png) [@tetanuss](https://forums.kodeco.com/u/tetanuss)\ **Post date:** [October 3, 2018, 10:10am UTC](https://forums.kodeco.com/t/chapter-1-page-30-and-xcode-9-3/42376/7 "2018-10-03T10:10:31Z")
In the new version (2.0) of the book and XCode 10.0 fclement post describes still the solution. In other words - the error with the Pegasus class is still in the book… ---
**Author:** ![shogunkaramazov](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/shogunkaramazov/32/108826_2.png) [@shogunkaramazov](https://forums.kodeco.com/u/shogunkaramazov)\ **Post date:** [October 30, 2018, 12:49pm UTC](https://forums.kodeco.com/t/chapter-1-page-30-and-xcode-9-3/42376/9 "2018-10-30T12:49:43Z")
---
**Author:** ![shogunkaramazov](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/shogunkaramazov/32/108826_2.png) [@shogunkaramazov](https://forums.kodeco.com/u/shogunkaramazov)\ **Post date:** [October 30, 2018, 12:50pm UTC](https://forums.kodeco.com/t/chapter-1-page-30-and-xcode-9-3/42376/10 "2018-10-30T12:50:55Z")
@lolgrep Do you have any feedback about this? Thank you - much appreciated! :] ---
**Author:** ![lolgrep](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/lolgrep/32/106950_2.png) [@lolgrep](https://forums.kodeco.com/u/lolgrep)\ **Post date:** [October 30, 2018, 1:35pm UTC](https://forums.kodeco.com/t/chapter-1-page-30-and-xcode-9-3/42376/11 "2018-10-30T13:35:00Z")
Check out the 3rd edition of the book which covers Xcode 10