what is this error...

what is this error...

hi,

what is this error please...   (screenshot attached..)

I think this is because I'm using a newer vesion of jQuery (3.6.0)

I tried finding an older version, tried with  2.2.4, got same error..

with 3.6.0 I did install jquery-migrate-1.4.1, but still got same error..
(I assume you call 3.6.0, THEN this migrate thing, I mean in <head>?)

thank you...