I have just installed Opencart Ver 3.x on my Google Cloud hosting.
After uploading OpenCart folders to the server through FileZilla, I've successfully activated the Journal theme on my site. However, when Im trying to move the "storage" folder outside the web directory, the system keeps warning me "Syntax Error: Unexpected token < in JSON at position 0..." (the rest of the message could be seen on attached image).

I've set the permission of the "config.php" file to 775, also the "modification" and "upload" folder in system/storage, but it doesn't work. Please help me deal with this problem. Thank you very much!
Vi