Crystal Reports
To use Crystal Reports in the Windows GUI, Web GUI or Indicium application tier, the Crystal Reports drivers must be installed on the client or web server. This concerns Crystal Reports Runtime 13 with service pack 20 for the right OS. With both, the support for the ASP.NET Web components must be installed.
Service Pack 21 and up are currently incompatible with the Thinkwise user interfaces.
(Source: https://www.crystalreports.com/crvs/confirm/)
For the Web GUI, the Crystal Reports installation creates a new directory to IIS with the name aspnet_client. This directory contains
the resources (HTML, JavaScript and CSS) which the Web GUI needs for the preview of reports. If the application is not
deployed in the IIS default website, then the aspnet_client directory can be copied to the corresponding website.
If the browser in which the preview is opened cannot access the aspnet_client folder, then a blank preview dialogue will open.
The unsuccessful request and what this refers to can be traced in the Network tab of the browsers Developer Tools (F12).
The unsuccessful request is colored red and refers to /aspnet_client/...
Check on the web server why this request gives no result. The folder within aspnet_client\system_web possibly contains an
incorrect version number and may have to be renamed.
If the report file is stored on a network location, then UNC paths must be used. For example:
//everest/datainstead ofS:\.