[keycloak-user] Uncaught SyntaxError: Unexpected end of JSON input on tutorial

Hi, I've installed Wildfly 11.0.0.Final and keycloak 3.4.3.Final and have run the following tutorials: https://github.com/keycloak/keycloak-quickstarts/blob/latest/service-jee-... https://github.com/keycloak/keycloak-quickstarts/tree/latest/app-jee-html5 But I end up getting Uncaught SyntaxError: Unexpected end of JSON input at JSON.parse (<anonymous>) at XMLHttpRequest.req.onreadystatechange (app.js:44) whatever I click on of "Invoke Public, "Invoke Secured" and "Invoke Admin". Does anyone else have the same problem I have? It the line in bold that gives the error: req.onreadystatechange = function () { if (req.readyState == 4) { if (req.status == 200) { *output.innerHTML = 'Message: ' + JSON.parse(req.responseText).message;* } else if (req.status == 0) { output.innerHTML = '<span class="error">Request failed</span>'; } else { output.innerHTML = '<span class="error">' + req.status + ' ' + req.statusText + '</span>'; } } }; Regards, Viggo