I have got above error while trying to do payment using AnetEMVSdk for iOS. I have used the latest SDK version 4.0.https://github.com/AuthorizeNet/inperson-sdk-ios
And I have checked there are no other apps open.
I have used AnywhereCommerce card for transaction. And I have got this issue in iOS 12.2 OS version and it's work fine when I have test with iOS 9.3.5.
I have used AnetEMVConnectionModeAudio for setting a connection mode
emvManager = [AnetEMVManager initWithCurrecyCode:@"840" terminalID:@"" skipSignature:NO showReceipt:NO];
[[AuthNet getInstance] setDelegate:self];
Here I have attached screenshots for reference.