After downloading Backyard Birds and following the steps in the section "Configure the sample code project" (i.e. enabling local StoreKit testing in the scheme).
When I run the macOS app from within XCode, the following error occurs.
Whenever I try to purchase any item from within the app, I am presented with the following error dialogue:
"Couldn’t communicate with a helper application. Try your operation again. If that fails, quit and relaunch the application and try again."
This happens after I click the purchase button (i.e. the button that displays the price).
The Xcode logs show the following errors:
Error handling payment sheet request: Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service created from an endpoint was invalidated from this process." UserInfo={NSDebugDescription=The connection to service created from an endpoint was invalidated from this process.}
Type: Error | Timestamp: 2025-09-26 18:05:36.214491+02:00 | Process: Backyard Birds | Library: StoreKit | Subsystem: com.apple.storekit | Category: Default | TID: 0xafed
followed by
Purchase did not return a transaction: Error Domain=ASDErrorDomain Code=5115 "Received failure in response from Xcode" UserInfo={NSDebugDescription=Received failure in response from Xcode, NSUnderlyingError=0x600001545470 {Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service created from an endpoint was invalidated from this process." UserInfo={AMSDescription=Ein unbekannter Fehler ist aufgetreten. Versuche es erneut., AMSURL=http://localhost:49244/WebObjects/MZBuy.woa/wa/inAppBuy, NSDebugDescription=The connection to service created from an endpoint was invalidated from this process., AMSStatusCode=200, AMSServerPayload={
"app-list" = (
);
dialog = {
cancelButtonString = Cancel;
defaultButton = Buy;
explanation = "Do you want to buy one Box of Nutrition Pellets for $3.99?\n\n[Environment: Xcode]";
initialCheckboxValue = 1;
"m-allowed" = 0;
message = "Confirm Your In-App Purchase";
okButtonAction = {
buyParams = "bid=com.example.apple-samplecode.Backyard-BirdsHQN4U5V5MY&bvrs=1.0&offerName=pellet.box&quantity=1&deviceVerification=0aee9116-fef7-5d20-b21b-b28848615717&storekitViewInitiated=true";
itemName = "pellet.box";
kind = Buy;
};
okButtonString = Buy;
paymentSheetInfo = {
caseControl = true;
confirmationTitle = Pay;
countryCode = US;
currency = USD;
designVersion = 2;
displayPrice = "$3.99";
flexList = (
{
value = (
{
style = priceMain;
value = "$3.99";
},
{
style = priceSub;
value = "One-time charge";
}
);
},
{
header = "$null";
value = "For testing purposes only. You will not be charged for confirming this purchase.";
}
);
price = "3.99";
requestor = AppStore;
salableIcon = "http://localhost:49244/StoreKit/AppIcon?bid=com.example.apple-samplecode.Backyard-BirdsHQN4U5V5MY";
salableIconType = app;
salableInfo = (
"Box of Nutrition Pellets %%image_0%%",
"Backyard Birds",
"In-App Purchase"
);
styles = (
{
bold = true;
name = priceMain;
size = large;
},
{
color = gray;
name = priceSub;
},
{
bold = true;
name = priceMainSpaceBefore;
size = large;
spacingBefore = medium;
}
);
title = {
type = text;
value = Xcode;
};
};
};
"download-queue-item-count" = 0;
dsid = 17322632127;
failureType = 5115;
jingleAction = inAppBuy;
jingleDocType = inAppSuccess;
pings = (
);
}}}}
Type: Error | Timestamp: 2025-09-26 18:05:36.346918+02:00 | Process: Backyard Birds | Library: StoreKit | Subsystem: com.apple.storekit | Category: Default | TID: 0xafea
I am running
Xcode Version 26.0.1 (17A400)
macOS Sequia 15.7
What I have tried so far:
created a new admin user, logged in as that user, installed Xcode and ran the Backyard Bird sample from there. Same error.
This also happens with my own app, when I am trying to test purchasing.
How can I further debug this problem?
Topic:
App & System Services
SubTopic:
StoreKit