First is the MACOSX_DEPLOYMENT_TARGET automatically being set to 10.9 (easy enough to resolve by editing the projucer). Needs to at least be 10.13 I believe. Might just be a matter of configuring this when setting up HISE.

Second issue is the xcodeproject is corrupted:

----- xcbeautify ----- Version: 2.28.0 ---------------------- 
2026-02-12 14:48:03.669 xcodebuild[46272:4429480] 
CFPropertyListCreateFromXMLData(): 
Old-style plist parser: missing semicolon in dictionary on line 949. 
Parsing will be abandoned. 
bla bla bla.....
Reason: The project ‘PROJECTNAME’ is damaged and cannot be opened due to a parse error. 
Examine the project file for invalid edits or unresolved source control conflicts. Path: 

So there's some type of string that Xcode is refusing to parse in the generated project.pbxproj