In order to build the base of the cash flow, Float needs to sync at least one bank account from the connected accounting platform. If no bank accounts are synced, the 'no bank accounts' error will be displayed.
If you haven't yet connected a bank account to your accounting platform you will need to do so, along with creating at least one transaction, before the cash flow can be generated in Float.
Once a bank account is connected, Float can be re-synced and that bank account will be introduced into the cash flow.
If you have already connected a bank account and are seeing the 'no bank accounts' error please get in touch with support@floatapp.com.