Not working, output error!

[CongAn]

$ echo "$(./sind.sh -t Title -o Okay -c)"
Title (↑/j or ↓/|k, enter: choose)
------------------------------------------------------------------------------------------------------
Okay

System version

NAME="Ubuntu"
VERSION="18.04.4 LTS (Bionic Beaver)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 18.04.4 LTS"
VERSION_ID="18.04"

There are also systems Mac OS 10.15.7 and CentOS 7 that don't work. But the functions provided by Alexander Klimetschek work properly.