You are attempting to add mileage rates to expenses, and are receiving the below error message.
Your company expense administrator needs to allocate mileage rates to your user account.
Expense Reports folder.
Setting Permissions for Mileage Rates.
This is caused by you not having the correct permissions allocated to your user profile.
To clear this error, you will need to ask the billing user/expenses approver of the account to set mileage rates for the corresponding company using these steps.