Error "Server has not specified Agent bootstrap version." when installing agent

[Federico Silva Armas]

• Downloaded installer jar from bamboo server.
• java -jar atlassian-bamboo-agent-installer-6.8.3.jar https://<server_url>/agentServer
• Log with error:

[WrapperSimpleAppMain] [RemoteAgentHttpClientFactory] Creating a new HTTP client...
[WrapperSimpleAppMain] [AgentContext] Authenticating against Bamboo server at https://<server_url>/agentServer/
[WrapperSimpleAppMain] [AgentContext] Successfully authenticated with Bamboo server
Exiting due to fatal exception.
java.net.ProtocolException: Server has not specified Agent bootstrap version. Please re-install the agent.

[Gonchik Tsymzhitov]

@Federico Silva Armas  Did you catch the error in the logs? 

I hope you just reinstalled the agent