Unexpected character ('<' (code 60)): expected a valid value (number, String, array, object, 'true', 'false' or 'null') at [Source: [B@77384bb4; line: 1, column: 2]

Please i have this problems when at this line

JenkinsServer jenkins = new JenkinsServer(new URI( "");
// this is the line wich make this problem
Map jobs = jenkins.getJobs();

JobWithDetails job = jobs.get("pgw").details();
System.out.println(job.getName());
System.out.println(jobs);