# X_E2E_APP_FAILED

## Means

the app an e2e run spawned did not come up

## Typical cause

the reset, the seed or the boot of the app the e2e step spawned failed. The cause names the step and carries its output. The app runs on a throwaway `ULTIMATE_STATE_DIR` (its own embedded database, disk and dev lock), so your own `.x/` is untouched

## Fix

`x dev --json`: boot the same app by hand and read why it would not start

[Testing](/error-codes#testing)