500 internal server error when using demo app in iOS

[SwiftMeister]

Hello developers!
I am having trouble when I run the demo project in iOS.
I changed the compiler settings to LLVM to make it run.
When I make an ocr request, I am getting this error '500- internal server error; You have reached your number of available requests.' as you can see in screenshot.
I know, it's been a long time since this library made available, but can you help me please?

[SwiftMeister]

Hello !
I made a new project (swift3; with new key) and tried to upload an image (images containing text; business cards ). This is what i get every time : 'Succeeded! Received 0 bytes of data'
Please help ASAP!