# Error messages

Find the code shown in GPSPhantom and the next step to try.

## tunnel_failed

Device connection lost. Reconnect the cable. Try a different port or cable if it repeats.

## device_gone

iPhone disconnected. Reconnect the cable.

## ddi_mount_failed

Developer image did not mount. Restart your iPhone and reconnect it.

## session_closed

Device session stopped. Reconnect the device.

## device_error

Device service failed. Reconnect the cable and try again.

## geocoder_unavailable

Place search unavailable. Check your internet connection and try again.

## route_too_few_points

Route needs another waypoint. Add at least one more waypoint to the route.

## route_zero_length

Route has no distance. Move the waypoints apart. They are all at the same place.

## pack_not_a_pack

Road file is not a pack. Download the region again. The file is not a GPSPhantom road pack.

## pack_version_unsupported

Road pack needs a newer app. Update GPSPhantom, then try the route again.

## pack_compression_unsupported

Road pack compression unsupported. Update GPSPhantom, then try the route again.

## pack_truncated

Road pack is incomplete. Download the region again. The saved file is incomplete.

## pack_corrupt

Road pack is corrupt. Download the region again. The saved road data cannot be used.

## pack_checksum

Road pack checksum failed. Download the region again. Its checksum did not match.

## pack_unreadable

Road pack cannot be read. Check that the packs folder is readable, then try again.

## pack_download_failed

Road pack download failed. Check your connection, then try the route again.

## map_tiles_unreachable

Online map tiles unavailable. Check your connection. Local map packs will keep working.

## map_pack_unreadable

Local map pack cannot be read. Reinstall the pack, then reopen GPSPhantom.

## map_style_invalid

Map style is invalid. Reopen GPSPhantom. If it repeats, install the latest version.

## map_gl_unavailable

WebGL unavailable. Update the computer's graphics drivers, then reopen GPSPhantom.

## map_gl_lost

WebGL context lost. The map will recover automatically. If it stays blank, reopen the window.

## map_config_invalid

Map configuration invalid. Fix map.json or remove the override, then reopen GPSPhantom.

## map_endpoint_invalid

Map endpoint unavailable. Check the endpoint address and your connection, then reopen GPSPhantom.

Note: If the error repeats, include its code when contacting support.

## Related articles

* [iPhone won't connect](https://docs.gpsphantom.com/troubleshooting/connection)

* [Route won't start](https://docs.gpsphantom.com/troubleshooting/routes)