Cannot execute AppleScript from app.

I am trying to run an AppleScript from my app which is sandboxed. I have got the user's consent(NSOpenPanel) to root directory so the app has permission to ready anything. I am not able to run any script, even a simple one like echo 'hellow world'. I tried to run it on the main thread with dispath_async(or performselectoronmainthread) but without success. The script part is as below :

NSString *zipScript = [NSString stringWithFormat:@"do shell script \"echo 'hello world'\""];

NSAppleScript *script = [[NSAppleScript alloc] initWithSource:zipScript];

NSDictionary *error2;

[script executeAndReturnError:&error2];

if(error2)

{

return false;

}

Full description of error2 is (i have removed the app's name) :

{

NSAppleScriptErrorAppName = "XXXXXXXX";

NSAppleScriptErrorBriefMessage = "The command terminated due to receipt of a signal.";

NSAppleScriptErrorMessage = "The command terminated due to receipt of a signal.";

NSAppleScriptErrorNumber = 1011;

NSAppleScriptErrorRange = "NSRange: {0, 170}";

}

Is there any reason/solution for this error?

Thanks in advance.