If you received the following error: Critical initialization error of type: PrismServiceError, the most common reasons and resolutions are as follows:

• You do not have enough free space on your C drive. Make sure you have at least 3GB of free space.
• The Sisense.Repository or Prism.Repository service is down and should be restarted. 
• Your web server service (SisenseWebExpress if you are using IISExpress, or IIS if you are using IIS) is down and should be restarted.

For Web Express:

You can access the services from the Control Panel > System and Security > Administrative Tools.

Select the service and click the Restart button.

For full IIS

1. In your start menu type 'cmd'.
2. Right click the shortcut and choose "Run as Administrator"
3. In the command line, type: "iisreset" hit Enter and wait for the IIS server to restart.
4. close the command prompt window.