"The upload destination folder does not appear to be writable"

[legendoniance]

I have successfully survived installing everything and configuring it up till the adding items part of the store.
Everything works perfectly fine, the commands in game, the cvars, the configs, the web panel, everything. The only technical thing not working is SMJansson, I cant get it to ever work with my OS.

My issue is when I add items to the store. I followed the wiki's tutorial, and i tried to add trails. I downloaded the package, drag and dropped correctly, and opened my store's web panel.

When I go to the JSON importer to import the json import file in the trails package, it keeps giving me an error saying "The upload destination folder does not appear to be writable"; I have googled, searched, tried many things, and nothing has helped.

I tried chmod 755 all relevant folders (my tf2 folder, my mysql installation, my apache install and folders, etc), didnt help

My setup:
-Mac OS X
-Local (local as in it is hosted locally on my computer and not a paid hosting service. It is internet-accessible.) TF2 servers
-Local apache server
-Local DNS server
-Local MySQL server

I have some screenshots of it, they are view-able at my website at http://ddlgaming.com/fakehfile.html .

PLEASE HELP ME, I'VE TRIED EVERYTHING FOR SO LONG.

[Arrow768]

I havnt worked with mac before, but verify that the upload folder is writeable (chmod 777 uploads)

[legendoniance]

Okay uh so I just went to redo the whole installation of the web panel, and chmodded ityeah, but now the next issue is:

Proxy Error

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request POST /storepanel/index.php/tools/confirm_import.

Reason: Error reading from remote server