Task: Sample error workflow

n8n workflow:
{"nodes":[{"name":"Twilio","type":"n8n-nodes-base.twilio","position":[900,300],"parameters":{"message":"=The workflow named '{{$node[\"Error Trigger\"].json[\"workflow\"][\"name\"]}}' with the ID {{$node[\"Error Trigger\"].json[\"workflow\"][\"id\"]}} has encountered an error."},"credentials":{"twilioApi":"Twilio"},"typeVersion":1},{"name":"Mattermost","type":"n8n-nodes-base.mattermost","position":[650,300],"parameters":{"message":"=The workflow named '{{$json[\"workflow\"][\"name\"]}}' with the ID {{$json[\"workflow\"][\"id\"]}} has encountered an error. The last node that was executed was {{$json[\"execution\"][\"lastNodeExecuted\"]}}.","attachments":[],"otherOptions":{}},"credentials":{"mattermostApi":"Mattermost"},"typeVersion":1},{"name":"Error Trigger","type":"n8n-nodes-base.errorTrigger","position":[450,300],"parameters":{},"typeVersion":1}],"connections":{"Mattermost":{"main":[[{"node":"Twilio","type":"main","index":0}]]},"Error Trigger":{"main":[[{"node":"Mattermost","type":"main","index":0}]]}}}