Hold up. How big of a crash. Are things dangling? Is power spewing? Immediately turn off the power at the breaker (by the garage door).
If it was minor (though no crash is minor), continue:
Servos - overload, recycle controller
VFD - check for error state. Manually start-stop spindle: M3/M5
Verify zero on all axis
If spindle stuck on tool changer: remove bolts on the tool holder
Integrity: chipped, dull, broken?
Collet: is tool held securely, collet loose, tool dropped?
Cause of crash - Do not continue until the cause has been identified and rectified.
Here's the Servo Guide which includes Error Codes.