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Task create failed error for NSTask

Hello all,
I tried to launch a application named "abc.app" use NSTask, I write code
as follows:
NSArray * args = [[NSArray alloc] initWithObjects:@"2", nil];
[NSTask launchedTaskWithLaunchPath:@"/Users/feil/Desktop/abc.app"
arguments:args];

I always get error message:Task create for path abc.app failed.

I think maybe I should change current directory for the NSTask, so I
change my code to
NSArray * args = [[NSArray alloc] initWithObjects:@"2", nil];
NSTask * theTask = [[NSTask alloc] init];
[theTask setCurrentDirectoryPath:@"/Users/feil/Desktop/"];
[theTask setLaunchPath:@"abc.app"];
[theTask setArguments:args];
[theTask launch];
But I also get the same error.

Thanks for any help for helping me out!

Fei



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