server terminated abnormally immediately after starting

After building electrumx in ~, and systemctl enable/start the server terminates abnormally with the following:

Jul 31 01:29:52 home71 systemd[1]: Started Electrumx.
Jul 31 01:29:52 home71 electrumx_server[28652]: INFO:electrumx:ElectrumX server starting
Jul 31 01:29:52 home71 electrumx_server[28652]: ERROR:electrumx:ElectrumX server terminated abnormally
Jul 31 01:29:52 home71 electrumx_server[28652]: Traceback (most recent call last):
Jul 31 01:29:52 home71 electrumx_server[28652]:   File "~/electrumx/electrumx_server", line 31, in main
Jul 31 01:29:52 home71 electrumx_server[28652]:     env = Env()
Jul 31 01:29:52 home71 electrumx_server[28652]:   File "~/electrumx/electrumx/server/env.py", line 50, in __init__
Jul 31 01:29:52 home71 electrumx_server[28652]:     self.coin = Coin.lookup_coin_class(coin_name, network)
Jul 31 01:29:52 home71 electrumx_server[28652]:                 ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
Jul 31 01:29:52 home71 electrumx_server[28652]:   File "~/electrumx/electrumx/lib/coins.py", line 65, in lookup_coin_class
Jul 31 01:29:52 home71 electrumx_server[28652]:     raise CoinError('unknown coin {} and network {} combination'
Jul 31 01:29:52 home71 electrumx_server[28652]:                     .format(name, net))
Jul 31 01:29:52 home71 electrumx_server[28652]: electrumx.lib.coins.CoinError: unknown coin Bitcoin and network mainnet combination
Jul 31 01:29:52 home71 systemd[1]: electrumx.service: Deactivated successfully.

in /etc/electrumx.conf I have COIN = Bitcoin which seemed to be a common param for COIN in several howtos I looked at for reference.

Any ideas what could be the issue or what to look at? Thks.

Start with the traceback in electrumx/server/env.py and electrumx/lib/coins.py, then inspect the COIN and network values loaded from /etc/electrumx.conf. Reproduce the systemd start and verify that the configured combination is accepted and the ElectrumX server remains running without the CoinError.