ganymed-ssh2-263 compilation issue

[murthy-nn]

I downloaded the source code from https://github.com/SoftwareAG/ganymed-ssh-2/archive/refs/tags/ganymed-ssh2-263.zip and tried to compile. I am getting following error. Please help me in resolving.

[ERROR] E:\workspace-Akka-1\ganymed-ssh-2-ganymed-ssh2-263\src\main\java\ch\ethz\ssh2\Connection.java:34: error: self-closing element not allowed
[ERROR] *

[ERROR] ^
[ERROR] E:\workspace-Akka-1\ganymed-ssh-2-ganymed-ssh2-263\src\main\java\ch\ethz\ssh2\HTTPProxyData.java:11: error: reference not found
[ERROR] * @see Connection#setProxyData(ProxyData)
[ERROR] ^