: Go to Xcode > Revoke Certificates within Cydia Impactor to clear old signing data.

Marco closed the laptop. He didn’t fix the error. He couldn’t. The error wasn’t in the code. It was in the ecosystem. Cydia Impactor still worked perfectly—if you had an iOS 9 device and an Apple ID created before 2019. But for everyone else, line 37 was a tombstone for a kind of freedom that used to exist.

This guide provides a foundational approach to addressing the line 37 error in Cydia Impactor and preparing a comprehensive paper on the topic.

Then he saw a single post on a dormant subreddit, timestamped three weeks ago. Six upvotes. One comment: “Line 37 isn’t an error. It’s a funeral. Use AltServer or move on.”

The is not a bug you need to fight—it is a tombstone for an outdated tool. While the App-Specific Password method will work for a tiny fraction of users still on macOS Mojave or iOS 12, the vast majority of modern iPhone users must move on.

Cydia Impactor "Line 37" errors, often appearing as provision.cpp:37 , typically signal a breakdown in communication between the tool and Apple's authentication servers . This is particularly common in 2026 as the tool has largely been superseded by modern alternatives.

result is the JSON payload sent back from Apple’s authentication server. In 2019, Apple changed the structure of this payload. Instead of a clean array with one team, they began returning:

If you see "Line 37" right after entering your Apple ID and password, the issue is almost certainly .