Uncaught ReferenceError: jQuery is not defined

Question

Have a problem with my code. Error: Uncaught ReferenceError: jQuery is not defined.
I know one way to fix it : place jquery link first, i did it and the error remained.
This problem in project Coin-slider: https://code.sololearn.com/WWZEeCCfgscI

Answer 1

The problem is that you use a script loaded from http protocol (jquery script) in a page thats served using a https protocol (SoloLearn) and this make browser block his loading for security reasons... Load it using https protocols (if server support it) or use another cnd with https support.
Futher details here
https://developer.mozilla.org/en-US/docs/Web/Security/Mixed_content