Unable to open the panel of roles

Today I installed DreamFactory on a centos server.
When I try to open the panel of the roles the page does not open and remains eternally waiting

the only fault I found this in the debug console browser

"Error: response.data.error is undefined
error@http://192.168.0.170/admin/js/app.js:313:7
ye/e/l.promise.then/w@http://192.168.0.170/static/angular/1.2.20/angular.min.js:100:38
ye/k/<.then/<@http://192.168.0.170/static/angular/1.2.20/angular.min.js:101:294
Zd/this.$get</k.prototype.$eval@http://192.168.0.170/static/angular/1.2.20/angular.min.js:111:361
Zd/this.$get</k.prototype.$digest@http://192.168.0.170/static/angular/1.2.20/angular.min.js:108:423
Zd/this.$get</k.prototype.$apply@http://192.168.0.170/static/angular/1.2.20/angular.min.js:112:183
h@http://192.168.0.170/static/angular/1.2.20/angular.min.js:72:456
w@http://192.168.0.170/static/angular/1.2.20/angular.min.js:77:355
we/</z.onreadystatechange@http://192.168.0.170/static/angular/1.2.20/angular.min.js:78:428

resolved, there was a problem with php mongo