Why not added the product to cart?

Not added products to cart for OpenCart.
When you click add to cart , the console gives an error :
Uncaught TypeError: $(...).button is not a function

The very line where the error is:
$('#cart > button').button('loading');
July 8th 19 at 11:54
2 answers
July 8th 19 at 11:56
What method have cequery? Where did you see it.
is OpenCart the file was originally there called common.js - norwood.Koelpin commented on July 8th 19 at 11:59
Something clearly not the same, no matter what you are using at cequery there is no such method, what you and the bug reports, who is clearly his error added, this method is the only jquery ui . Try to write as $(..).ui.button(..) - johnson_Rutherfo commented on July 8th 19 at 12:02
: all opencart it looks like this prntscr.com/bl9yxo but he's somewhere else cant - manuel commented on July 8th 19 at 12:05
Sorry apparently my knowledge is not enough, I have never worked with opencart maybe the answer below will help you more, because If this is true the standard script then you obviously forgot to connect that and you will add this plugin in jquery - johnson_Rutherfo commented on July 8th 19 at 12:08
July 8th 19 at 11:58
check to see if the script bootstrap.min.js
this method that there is

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