Info 2 Wifi transfer Pro

Hello people, I have a Galaxy S4 sgh-m919 with android 4.4.2 rooted. I have formatted the SDcard and when I was trying to use the Wifi Transfer Pro it doesn't recognize the External memory (when I transfer a file from my PC to my cellphone via Wifi It says and error has occur and it doesn't matter about the file size).

When I'm using my cellphone, it recognize the External memory, even when I plug to my computer and I can do the copy-paste file. I want to do it via Wifi no via USB cable.