Hello wendy,

First of all I would suggests that you check IIS logs + put Trace logs in your code to see exactly what's going on.

Please see: Troubleshooting (SSRS)

As for the basic configuration on the SSRS report please see: Create a Basic Table Report (SSRS Tutorial)

If you can narrow down the problem using IIS logs or the troubleshoot article then community members would be able to help you more.

With Regards,

Krunal Parekh