Possible errors and their explanations are listed here. If there is an error that is not listed, use the TTN Community to find an answer.
The application does not have an access key that can manage devices.
There is no access key with sufficient permissions. Please make sure that the application you are managing has an access key with access to "devices" and "setings".
No handler discovered. Please logout and try again.
This error shows when your application is not registered with a handler. Open the application in the TTN Console and choose a handler for it.
Invalid input: ABCDEF1234567890ABCDEF1234567890 is not hex
Make sure the correct CSV columns are selected for DevEUI, AppEUI and AppKey and that they are all of a valid format.
handler:device:application-name:xignal-abcdef1234567890 not found
This is not necessarily an error, it just means that the given device id was not found for the given application.
permission denied: Broker did not set device: permission denied: NetworkServer did not set device: permission denied: No "devices" rights to Application "application-name"
This error means it was unable to sync the device to the application. A hint for where the error may come from is shown at the end; here it shows the application name it is conflicting with.
It could also mean that there is no access key with sufficient permissions. Please make sure that the application you are managing has an access key with access to "devices" and "setings".
HTTP error / cURL error / Could not handle returned data
This means the application had trouble talking to TTN. HTTP errors are caused by sending incorrect data to TTN. Please make sure the correct columns have been selected and that the data is in a valid format.
cURL errors are usually caused by a server problem. If trying again with the correct data does not work, contact support.
A critical error occurred while handling a request / Could not communicate with internal API
This is most likely a server problem. If the supplied data is correct, contact support with the information in your browser.
