html opens but when hit generate nothing happens and if run .js script error below happens

[apifarmer]

Uncaught ReferenceError ReferenceError: $ is not defined
at (c:\Users\Desktop\backlink-maker-main\backlink-maker-main\script.js:9:6)
at Module._compile (internal/modules/cjs/loader:1378:14)
at Module._extensions..js (internal/modules/cjs/loader:1437:10)
at Module.load (internal/modules/cjs/loader:1212:32)
at Module._load (internal/modules/cjs/loader:1028:12)
at executeUserEntryPoint (internal/modules/run_main:142:12)
at (internal/main/run_main_module:28:49)
script.js:9
Process exited with code 1