TypeError: Cannot create property ‘tremtr_reservation_date’ on string ‘<'

Hello,

I have a WordPress Website running on nginx and php7.2 and I installed your plugin but unfortunately it is generating 2 Errors:

app.504a35b….js?ver=1.0.0:1 Uncaught (in promise) TypeError: Cannot create property ‘tremtr_reservation_date’ on string ‘<‘
at o.<anonymous> (app.504a35b….js?ver=1.0.0:1)
(anonymous) @ app.504a35b….js?ver=1.0.0:1
Promise.then (async)
de.then @ vendor.6d137089d7b61…866.js?ver=1.0.0:16
initCanvas @ app.504a35b….js?ver=1.0.0:1
mounted @ app.504a35b….js?ver=1.0.0:1
Ne @ vendor.6d137089d7b61…9866.js?ver=1.0.0:6
insert @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
b @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
(anonymous) @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
e._update @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
r @ vendor.6d137089d7b61…9866.js?ver=1.0.0:6
wo.get @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
wo @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
Ce @ vendor.6d137089d7b61…9866.js?ver=1.0.0:6
At.$mount @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
At.$mount @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
e._init @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
At @ vendor.6d137089d7b61…9866.js?ver=1.0.0:6
NHnr @ app.504a35b….js?ver=1.0.0:1
n @ manifest.0ff12719662…00e7.js?ver=1.0.0:1
window.webpackJsonp @ manifest.0ff12719662…00e7.js?ver=1.0.0:1
(anonymous) @ app.504a35b….js?ver=1.0.0:1

app.504a35b….js?ver=1.0.0:1 Uncaught (in promise) TypeError: Cannot read property ‘rendered’ of undefined
at o.<anonymous> (app.504a35b….js?ver=1.0.0:1)
(anonymous) @ app.504a35b….js?ver=1.0.0:1
Promise.then (async)
de.then @ vendor.6d137089d7b61…866.js?ver=1.0.0:16
initCanvas @ app.504a35b….js?ver=1.0.0:1
mounted @ app.504a35b….js?ver=1.0.0:1
Ne @ vendor.6d137089d7b61…9866.js?ver=1.0.0:6
insert @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
b @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
(anonymous) @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
e._update @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
r @ vendor.6d137089d7b61…9866.js?ver=1.0.0:6
wo.get @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
wo @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
Ce @ vendor.6d137089d7b61…9866.js?ver=1.0.0:6
At.$mount @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
At.$mount @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
e._init @ vendor.6d137089d7b61…866.js?ver=1.0.0:11
At @ vendor.6d137089d7b61…9866.js?ver=1.0.0:6
NHnr @ app.504a35b….js?ver=1.0.0:1
n @ manifest.0ff12719662…00e7.js?ver=1.0.0:1
window.webpackJsonp @ manifest.0ff12719662…00e7.js?ver=1.0.0:1
(anonymous) @ app.504a35b….js?ver=1.0.0:1

Please help.

Thank you!