Use ambari metrix plugin but a error happen

grafana version 5.0.4
i down load plugin from https://grafana.com/plugins/praj-ams-datasource
hdfs-datanode can not show is there any one konw this ?
Panel data error: TypeError: Cannot read property ‘hosts’ of undefined
at AmbariMetricsDatasource.query (datasource.js:formatted:232)
at e.issueQueries (metrics_panel_ctrl.ts:270)
at e.issueQueries (module.ts:214)
at u (angular.js:17145)
at angular.js:17193
at d.$digest (angular.js:18331)
at d.$apply (angular.js:18628)
at HTMLButtonElement. (angular.js:27456)
at HTMLButtonElement.dispatch (jquery.js:5206)
at HTMLButtonElement.g.handle (jquery.js:5014)

TypeError
columnNumber: 1
fileName: “http://deploy:3000/public/build/0.2ba40e7163b7f9a6ed4b.js line 1 > eval”
lineNumber: 232
message: “templateSrv._index is undefined”
stack: “AmbariMetricsDatasource/this.query@http://deploy:3000/public/plugins/praj-ams-datasource/datasource.js:232:1\n[1523]/f</e.prototype.issueQueries@http://deploy:3000/public/build/0.2ba40e7163b7f9a6ed4b.js:7:17817\n[1580]/d</e.prototype.issueQueries@http://deploy:3000/public/build/0.2ba40e7163b7f9a6ed4b.js:7:204115\nu@http://deploy:3000/public/build/vendor.2c3c591224fb193f7fd3.js:92:69119\nl/<@http://deploy:3000/public/build/vendor.2c3c591224fb193f7fd3.js:92:69565\n$digest@http://deploy:3000/public/build/vendor.2c3c591224fb193f7fd3.js:92:75262\n$apply@http://deploy:3000/public/build/vendor.2c3c591224fb193f7fd3.js:92:77074\ncompile/</<@http://deploy:3000/public/build/vendor.2c3c591224fb193f7fd3.js:92:148889\ndispatch@http://deploy:3000/public/build/vendor.2c3c591224fb193f7fd3.js:87:34690\nadd/g.handle@http://deploy:3000/public/build/vendor.2c3c591224fb193f7fd3.js:87:32734\n

please reach out to ambari metrix plugin authors.

How can I connect with Prajwal Rao