Sangoma Freepbx 16 & php errors on some admin pages

[ADB100]

I've got a Freepbx 16 VM that is used purely in a lab, however it has a SIP client connection to SIPGate for inbound calls. Its also got some SIP IP phones registered and some trunks to other test devices.
Its all working, however some of the admin web pages don't display and I get a PHP error. For example if I attempt to open the 'Feature Codes' page I get a 'Whoops \ Exception \ ErrorException (E_WARNING)' with the error 'A non-numeric value encountered' and there is a screenshot of the .php script(?) error. This occurs on other pages as well - 'Settings, Extension Settings' and when trying to add an Extension (Applications, Extensions, add SIP extension and subnet

Any ideas how to fix?

 

[ADB100]

Fixed it...

For some reason the Parking Lot configuration was missing settings in these fields:

'Parking Lot Extension'
'Parking Lot Starting Position'

Once I put the defaults back in (70 & 71), the errors have gone.