Why did I get an error running my report?

This can happen for a number of reasons including temporary loss of connection.

Solution

A hard refresh of the browser clears the error most of the time.
To hard refresh in Chrome: 

1. Windows users: hold down Ctrl and then press F5 on your keyboard or hold down Ctrl and click the Reload button on the browser
2. Mac users: hold down Cmd and Shift and then press R on your keyboard