Oh, I am responsible for this. This is due to an incompatibility between the 
very recent WebKit you built and the older system’s Safari.
I will look into fixing this shortly, thanks for letting me know.

--
 Chris Dumez




> On Apr 10, 2019, at 4:44 AM, Assaf Inbal <shmuel...@gmail.com> wrote:
> 
> Hey,
> 
> I’m trying to build and run (top-of-branch) WebKit to debug some weird 
> behaviour and am running into some issues.
> I compiled everything on macOS with `./Tools/Scripts/build-webkit --debug` 
> which seemed to work just find but when I go ahead and run Safari via 
> `./Tools/Scripts/run-safari --debug` I get an exception and the program exits:
> 2019-04-10 14:34:38.256 SafariForWebKitDevelopment[644:9602] *** Terminating 
> app due to uncaught exception 'NSInvalidArgumentException', reason: 'Related 
> web view <WKWebView: 0x7fbc8752ce00> has data store <WKWebsiteDataStore: 
> 0x7fbc872856e0> but configuration specifies a different data store 
> <WKWebsiteDataStore: 0x7fbc87562590>'
> Not sure what this means exactly and couldn’t find anything similar online.
> 
> Any help would be appreciated.
> 
> Thanks!
> 
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> webkit-dev@lists.webkit.org
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