[BlueOnyx:25033] Roundcube not working on 5210R

[Colin Jack]

Just purchased and installed Solarspeed Roundcube 1.4.11 on a new 5210R

Not working:

[Mon Jul 26 09:54:32.494765 2021] [core:error] [pid 168950] [client 66.249.74.38:48514] End of script output before headers: index.php
[Mon Jul 26 09:55:18.153873 2021] [core:error] [pid 168951] [client 91.135.0.122:25498] End of script output before headers: index.php, referer: https://mail.domain.com/

Colin