This started with Xcode 26 beta 7, however it has continued to occur with the release candidate. Whenever I try to compile our asset catalog + icon composer icon for our AppKit/SwiftUI-based macOS app, actool fails with the following exception:
*** Terminating app due to uncaught exception 'IBPlatformToolFailureException', reason: 'The tool closed the connection (AssetCatalogAgent-AssetRuntime)
Last command:
_ON_QUEUE_sendMessage:toChannelReturningError:during:
Backtrace of last command:
0 -[IBAbstractPlatformToolProxy _ON_QUEUE_sendMessage:toChannelReturningError:during:] (in IDEInterfaceBuilderKit)
1 __74-[IBAbstractPlatformToolProxy sendMessage:toChannelReturningError:during:]_block_invoke (in IDEInterfaceBuilderKit)
2 _dispatch_client_callout (in libdispatch.dylib)
3 _dispatch_lane_barrier_sync_invoke_and_complete (in libdispatch.dylib)
4 DVTDispatchSync (in DVTFoundation)
5 -[IBAbstractPlatformToolProxy sendMessage:toChannelReturningError:during:] (in IDEInterfaceBuilderKit)
6 -[AssetCatalogRemoteAgentProxy compileItemsWithCatalogRelativeIdentifierPaths:tagSolutionSpace:andStickerPacksWithCatalogRelativeIdentifierPaths:options:] (in IDEInterfaceBuilderCocoaTouchIntegration)
7 -[IBICLARToolCARCompiler compileCARItems:tagSolutionSpace:options:queue:completionHandler:] (in AssetCatalogCocoaTouchKit)
8 -[IBICAbstractPlatformAdapter compileCARItems:tagSolutionSpace:options:queue:completionHandler:] (in AssetCatalogFoundation)
9 __84-[IBICAbstractPlatformAdapter compileSelectedItems:options:queue:completionHandler:]_block_invoke (in AssetCatalogFoundation)
10 __93-[IBICAbstractPlatformAdapter compileStandaloneCatalogItems:options:queue:completionHandler:]_block_invoke (in AssetCatalogFoundation)
11 __DVT_CALLING_CLIENT_BLOCK__ (in DVTFoundation)
12 __DVTDispatchAsync_block_invoke (in DVTFoundation)
13 _dispatch_call_block_and_release (in libdispatch.dylib)
14 _dispatch_client_callout (in libdispatch.dylib)
15 _dispatch_main_queue_drain.cold.5 (in libdispatch.dylib)
16 _dispatch_main_queue_drain (in libdispatch.dylib)
17 _dispatch_main_queue_callback_4CF (in libdispatch.dylib)
18 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ (in CoreFoundation)
19 __CFRunLoopRun (in CoreFoundation)
20 CFRunLoopRunSpecific (in CoreFoundation)
21 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] (in Foundation)
22 -[NSRunLoop(DVTNSRunLoopAdditions) dvt_spinRunLoopInMode:whileQueue:executesAsynchronously:] (in DVTFoundation)
23 -[NSRunLoop(DVTNSRunLoopAdditions) dvt_spinRunLoopInMode:whileBlockExecutesConcurrently:] (in DVTFoundation)
24 -[NSRunLoop(DVTNSRunLoopAdditions) dvt_spinRunLoopInMode:waitingForSemaphore:] (in DVTFoundation)
25 -[IBCLIImageCatalogToolPersona compileCatalogCollection:withPlatformAdapter:arguments:outputDictionary:] (in ibtoold)
26 -[IBCLIImageCatalogToolPersona invokeArguments:outputDictionary:] (in ibtoold)
27 -[IBCLIImageCatalogToolPersona runSingleInvocation:outputtingToFileHandle:andVerifyingEnvironment:] (in ibtoold)
28 IBCLIServerRunSingleInvocation (in ibtoold)
29 __IBCLIServerRunSingleInvocationWithIODirectedAtPipesAndUnlinkOnSuccess_block_invoke_2 (in ibtoold)
30 __IBCLIServerRunSingleInvocationWithIODirectedAtPipesAndUnlinkOnSuccess_block_invoke (in ibtoold)
31 -[IBCLIErrorForwarder forwardErrorOutputToDescriptor:whileInvokingBlock:] (in ibtoold)
32 IBCLIServerRunSingleInvocationWithIODirectedAtPipesAndUnlinkOnSuccess (in ibtoold)
33 main (in ibtoold)
34 start (in dyld)
I can't seem to get it to compile consistently — it works fine locally.
I would ❤️ a workaround, otherwise I'm not sure that we'll be able to ship an update to our app for macOS 26.
FB20183399
