deserializeJson() failed: EmptyInput

[ccadic]

Hi.
I have issues with the ino on a M5stack core1
setup is here:
https://github.com/ccadic/The603-200/blob/main/ln1.jpg
https://github.com/ccadic/The603-200/blob/main/ln2.jpg

I created a wallet on lnbits.com then an invoice.
Isaved the key while setting the wifimanager params
the wifimanager seems to work , I get an ip I can ping

after unning the sketch if have a
deserializeJson() failed: EmptyInput
8889e27b3e754736ad8b87440dccb471
deserializeJson() failed: EmptyInput
8889e27b3e754736ad8b87440dccb471

I am a beginner. i do not know what I made wrong.
is it a network pb or an invoice read key config ?
is the lntrigger.ino still compatible the lnbits.com ?
my feeling is that the ino does not access the server

any suggestion ?