I can receive files from my PC and Mac to my n900 but I can't send files from my n900 to PC and Mac and I'm getting the error message "Connection Failed to (name of you PC or Mac)"

are there any ways i can solve this? so i can send files using my nokia n900 to my PC and Mac??

My question would be How to send files in the File Manager and Micro sd of the n900 thru bluetooth to PC and Mac without getting an error message. Thanks.