The default script of Crystal Reports are not loading. You need to add the script tag pointing to the crv.js JavaScript file in the crystalreportviewers13 folder inside the Website root folder.

You need to place the script tag in the Head section of the page or Master Page if you are using Master Pages.

Refer below article.

Crystal Reports Bobj is undefined and bobj.isObject is not a function in Visual Studio 2012 and 2013