37 | Cydia Impactor Error Line

If you have tried all the steps above and still encounter error line 37, it may be time to consider modern alternatives. Cydia Impactor requires an active Apple Developer Account ($99/year) to work seamlessly for many users due to structural changes made by Apple.

Common causes and how they map to that error

// Line 30-40 json teams = result["teams"]; assert(teams.is_array()); assert(teams.size() == 1); // <-- THIS IS LINE 37

This article was last updated in May 2026 to reflect the current state of iOS sideloading tools and error‑resolution techniques.

If the error persists, the IPA file itself might be modified incorrectly or corrupted. Download the IPA file from a different, trusted source.

: A highly stable, frequently updated desktop tool for Windows and macOS that serves as a direct replacement for Cydia Impactor.

Open Cydia Impactor.

37 | Cydia Impactor Error Line

Common causes and how they map to that error cydia impactor error line 37

// Line 30-40 json teams = result["teams"]; assert(teams.is_array()); assert(teams.size() == 1); // <-- THIS IS LINE 37 If you have tried all the steps above

This article was last updated in May 2026 to reflect the current state of iOS sideloading tools and error‑resolution techniques. If the error persists, the IPA file itself

If the error persists, the IPA file itself might be modified incorrectly or corrupted. Download the IPA file from a different, trusted source.

: A highly stable, frequently updated desktop tool for Windows and macOS that serves as a direct replacement for Cydia Impactor.

Open Cydia Impactor.