Thank you for translation, I added [NSNumber class] & [NSString class], the system is satisfied. I still do not know what will be disallowed.

Another difference, maybe, I used objective-C

No framework, the projects I mentioned arose on Xcode 4.2, maybe a difference .

id description = [_orderMax description]; // _orderMax = property NSImage    NSLog(@"%@ \n", description); 2022-12-12 15:46:27.740485+0100 GreenMath.0[2992:389625] <NSImage 0x60c00007a300 Name=color010 Size={32, 32} Reps=(     "NSBitmapImageRep 0x60c0000a36c0 Size={32, 32} ColorSpace=(not yet loaded) BPS=8 BPP=(not yet loaded) Pixels=32x32 Alpha=NO Planar=NO Format=(not yet loaded) CurrentBacking=nil (faulting) CGImageSource=0x60c000030180" )> You can see, its t he same I send you . Uwe

Hello, I was glad to find this solution, but there is a stolperstein: I use macOS Sierra, writeToURL:: was not available. I used  fileURL.absoluteString and writeToFile:: The method ran, but without success, the path looks o.k. file:///Users/uwejagoda/Documents/Geek/data.vr, data is an archived empty Dictionary. I hope you have a brain wave (Waves are my lifeblood) Uwe