The error arise due to trap 'continue' SIGINT. From help trap:

ARG is a command to be read and executed when the shell receives the signal(s) SIGNAL_SPEC

So your script try to do continue command when recive SIGINT call but the continue is used in loops only.

The error arise due to trap 'continue' SIGINT. From help trap:

ARG is a command to be read and executed when the shell receives the signal(s) SIGNAL_SPEC

So your script try to do continue command when receive SIGINT call but the continue is used in loops only.