Can not select USB folder on RP2

Hello,
I have a Raspberry Pi 2 and installed Subsonic succesfully on my RP2. I can open the subsonic page in my browser from another computer in my network.
The problem I have is that I can not select my 16 GB Sandisk Cruzer USB 2.0 driver in the Subsonic settings page as my music folder.
The folder after the name "USB" is the folder that I am using. You can see here that it says "folder not found"
On my RP2 I did a "pwd" to print the directory of my USB. You can see that I have typed the same directory.
Thanks in advance!
I have a Raspberry Pi 2 and installed Subsonic succesfully on my RP2. I can open the subsonic page in my browser from another computer in my network.
The problem I have is that I can not select my 16 GB Sandisk Cruzer USB 2.0 driver in the Subsonic settings page as my music folder.
The folder after the name "USB" is the folder that I am using. You can see here that it says "folder not found"

On my RP2 I did a "pwd" to print the directory of my USB. You can see that I have typed the same directory.

Thanks in advance!