Trying this code:

var connection = new Connection(host:"xxxxxx.myjetbrains.com", path:"youtrack");
connection.Authenticate("User", "Password");

var issueManagement = new IssueManagement(connection);
var issues = issueManagement.GetAllIssuesForProject("projectId");

The message is: Unable to find a suitable constructor for instantiating the target Type. (YouTrackSharp.Issues.Issue[])
There is one issue in the project so I would expect it would find that issue.

This happens both in 1.0.11 and in the current master source from GitHub.