You need to conduct some further testing, or call service tech. I would approach it by using known good battery, and then:
1)Checking voltage on both contactor connections.
2) checking voltage at keyswitch/cancode/easyacess
3) checking for voltage at both emergency stop connections
4) checking if battery plug(machine side) is okay
Checking main and all fuses.
5) furthermore can bus diagnosis, checking controller connections, wiring for damage(mice?)