This error indicates that the push registration method in your application is being called with a null or empty token value.
Recent versions of the Pushwoosh SDK have introduced stricter validation for push tokens. Previously, an attempt to register an empty token might have failed silently. The new behavior is to explicitly report this as an error via a callback to make integration issues more transparent and easier to debug.
To resolve this, please ensure that your application's code only calls the registration method after a valid push token has been successfully obtained from the corresponding push service (e.g., FCM or APNs).
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