Human-readable message indicating the problem that happened.
Note that, while this message is readable by a human, it is not meant to be displayed to end users. The message itself can be rather cryptic, and is meant for developers to understand the problem that happened.
Indicates that the given chain connection has encountered an error and can no longer continue.
The chain is automatically considered as "dead". No ToExtensionRemoveChain message needs to be sent.
This message can happen either before or after a ToApplicationChainReady concerning this chain has been sent.