xcodeproj fails to initialize object from unknown ISA: PBXFileSystemSynchronizedRootGroup

[xinsight]

Xcode 16, I added a folder "Fonts" to my project and xcodeproj now fails with the following:

/opt/homebrew/lib/ruby/gems/3.0.0/gems/xcodeproj-1.25.0/lib/xcodeproj/project/object.rb:359:in rescue in object_with_uuid': PBXGroupattempted to initialize an object with unknown ISAPBXFileSystemSynchronizedRootGroupfrom attributes:{"isa"=>"PBXFileSystemSynchronizedRootGroup", "explicitFileTypes"=>{}, "explicitFolders"=>[], "path"=>"Fonts", "sourceTree"=>""}` (RuntimeError)

If this ISA was generated by Xcode please file an issue: https://github.com/CocoaPods/Xcodeproj/issues/new

[xinsight]

Workaround: Use "New Group" instead of "New Folder".

[Flexible-Universe]

When I use 'New Group,' it works. Every newly created project in Xcode 16 now always creates folders. Is there already a timeline for when it will also work with folders?

[xinsight]

Looks like all these issues are the same Xcode 16 issue:
#968
#967
#965
#963
#950
#951

[AIFlowML]

Having same issues and more

[Xcodeproj] Xcode project version (77) is higher than the latest supported by xcodeproj (63)

[xinsight]

Correct, when i added a folder, the xcodeproj version gets bumped from 54 -> 70. And when i remove the folder and use a group, it gets automatically downgraded.

--- a/XXX.xcodeproj/project.pbxproj
+++ b/XXX.xcodeproj/project.pbxproj
@@ -3,7 +3,7 @@
 	archiveVersion = 1;
 	classes = {
 	};
-	objectVersion = 70;
+	objectVersion = 54;
 	objects = {
 
 /* Begin PBXAggregateTarget section */

[Varun-Sethi-Dev]

Same issue any fixes around it

[sapnabansaltrinet]

I am also facing the same issue with creation of new project in Xcode16

[ninacoder-info]

@sapnabansaltrinet i just convert the OneSignalNotificationServiceExtension to Group and it working fine, but screw OneSignal its always the one cause trouble, really tired everytime using it

[amorde]

This is fixed by #985 and shipped in 1.26.0

[thisisadithk]

@sapnabansaltrinet i just convert the OneSignalNotificationServiceExtension to Group and it working fine, but screw OneSignal its always the one cause trouble, really tired everytime using it

This worked for me. Went to Xcode, right clicked on the OneSignalNoificationSeviceExtension folder (which would be in blue), clicked on the "Convert to Group" option, the color changes to grey. Ran pod install in the iOS folder and the build error was no longer coming. Successfully installed pods.