Ajuda com o uploadify

Efetuei o download do projeto do artigo "Upload de múltiplos arquivos em ASP.NET Web Forms com o plugin Uploadify" e o resultado esperado não é igual ao que mostra o artigo. No artigo está mostrando que é possível fazer upload de varias imagens e depois carrega-las na página, eu só estou conseguindo selecionar uma imagem de cada vez e mesmo assim ela não carrega na página.

Está apresentando as seguintes mensagens no Output do Visual Studio:

Javascript Intellisense Message: C:\\\\Users\\\\fabiano.oliveira\\\\Downloads\\\\TesteUploadWebForms\\\\TesteUploadWebForms\\\\Scripts\\\\jquery-1.8.1.min.js(2:19274) : Object required
Javascript Intellisense Message: C:\\\\Users\\\\fabiano.oliveira\\\\Downloads\\\\TesteUploadWebForms\\\\TesteUploadWebForms\\\\Scripts\\\\jquery-1.8.1.min.js(2:50895) : Function expected
Javascript Intellisense Message: C:\\\\Users\\\\fabiano.oliveira\\\\Downloads\\\\TesteUploadWebForms\\\\TesteUploadWebForms\\\\Scripts\\\\jquery-1.8.1.min.js(2:51463) : Object required
Javascript Intellisense Message: C:\\\\Users\\\\fabiano.oliveira\\\\Downloads\\\\TesteUploadWebForms\\\\TesteUploadWebForms\\\\Scripts\\\\jquery-1.8.1.min.js(2:16329) : Function expected
Javascript Intellisense Message: C:\\\\Users\\\\fabiano.oliveira\\\\Downloads\\\\TesteUploadWebForms\\\\TesteUploadWebForms\\\\Scripts\\\\jquery-1.8.1.min.js(2:16367) : Function expected
Javascript Intellisense Message: C:\\\\Users\\\\fabiano.oliveira\\\\Downloads\\\\TesteUploadWebForms\\\\TesteUploadWebForms\\\\Scripts\\\\jquery-1.8.1.min.js(2:78227) : Object required
Javascript Intellisense Message: C:\\\\Users\\\\fabiano.oliveira\\\\Downloads\\\\TesteUploadWebForms\\\\TesteUploadWebForms\\\\Scripts\\\\jquery-1.8.1.min.js(2:82931) : Function expected
Javascript Intellisense Message: C:\\\\Users\\\\fabiano.oliveira\\\\Downloads\\\\TesteUploadWebForms\\\\TesteUploadWebForms\\\\Scripts\\\\jquery-1.8.1.min.js(2:83044) : Function expected
Javascript Intellisense Message: C:\\\\Users\\\\fabiano.oliveira\\\\Downloads\\\\TesteUploadWebForms\\\\TesteUploadWebForms\\\\Scripts\\\\jquery-1.8.1.min.js(2:83750) : Function expected
Javascript Intellisense Message: C:\\\\Users\\\\fabiano.oliveira\\\\Downloads\\\\TesteUploadWebForms\\\\TesteUploadWebForms\\\\Scripts\\\\jquery-1.8.1.min.js(2:83981) : Function expected
Javascript Intellisense Message: C:\\\\Users\\\\fabiano.oliveira\\\\Downloads\\\\TesteUploadWebForms\\\\TesteUploadWebForms\\\\Scripts\\\\jquery-1.8.1.min.js(2:84088) : Function expected
Javascript Intellisense Message: C:\\\\Users\\\\fabiano.oliveira\\\\Downloads\\\\TesteUploadWebForms\\\\TesteUploadWebForms\\\\Scripts\\\\jquery-1.8.1.min.js(2:84679) : Object required
Javascript Intellisense Message: C:\\\\Users\\\\fabiano.oliveira\\\\Downloads\\\\TesteUploadWebForms\\\\TesteUploadWebForms\\\\Scripts\\\\jquery.uploadify.js(8:157) : Function expected

Segue o link do artigo:
https://www.devmedia.com.br/upload-de-multiplos-arquivos-em-asp-net-web-forms-com-o-plugin-uploadify/26105