trouble in using jointly with "find" and folders

[maccouch]

Hi. I'm having a problem using the "find" command and trash regarding folders. i have a simple script i call daily to remove folders and files older than 7 days. somehow, files get removed but folders are a hit or miss... Not sure if it is due to the way the command is written or if a bug. A Simple sample is attached below. I can use the same line with "rm -r" instead of trash and it works, but with trash, either through "trash -a" or "Trash" only, i've got this error, while simulatenously deleting the folder.

However, by calling this script through Crontab, i've noticed it not always deletes the folders, although i'm not sure why or when. Could you help me out?
Thanks

sh-3.2$  find /Users/Shared/01.Downloads/01.Downloaded_Apps_Folder  -mtime +4 -type d

/Users/Shared/01.Downloads/01.Downloaded_Apps_Folder/sysdiagnose_2015.03.17_12-01-19+0000_0/logs/asl/AUX.2015.03.16

/Users/Shared/01.Downloads/01.Downloaded_Apps_Folder/Vodafone Mobile Broadband 4.10.09.00.dmg-2.download

sh-3.2$  find /Users/Shared/01.Downloads/01.Downloaded_Apps_Folder  -mtime +4 -type d -exec /usr/local/bin/trash -a {} \; 2>&1

find: /Users/Shared/01.Downloads/01.Downloaded_Apps_Folder/sysdiagnose_2015.03.17_12-01-19+0000_0/logs/asl/AUX.2015.03.16: No such file or directory

find: /Users/Shared/01.Downloads/01.Downloaded_Apps_Folder/Vodafone Mobile Broadband 4.10.09.00.dmg-2.download: No such file or directory

sh-3.2$  find /Users/Shared/01.Downloads/01.Downloaded_Apps_Folder  -mtime +4 -type d

sh-3.2$