You are checking your login information using the Integration Self Test (http://developer.avalara.com/avatax/self-test)and an error indicating not enough information was entered appears instead of a message indicating the credentials are good or bad, error:
Testing could not be completed due to insufficient or invalid data.
There are no saved transactions on the specified company in the given date range.
This error indicates you are clicking Run Analysis instead of Check Credentials and have entered a login (either an individual username and password or an account number and license key) and also an Account number, but have not selected a company from the drop down menu
To use this Run Analysis feature, select a company in the drop down menu CompanyCode > Enter a date in the Start and End fields > Click Run Analysis
An analysis of your account setup and test data appear
Most customers use this tool to verify their account number and license key are current, to complete that test enter the information as described here: