Return error message

index.js

@@ -131,11 +131,14 @@ app.get('/runR', (req, res, next) => {
     R('./r/selected_data.r').call(
         function(err, data) {
             console.log('R done');
-            if (err) console.log(err.toString('utf8'))
+            if (err) {
+                console.log(err.toString('utf8'));
+                data = { result: err.toString('utf8') };
+            }
             else {
-							console.log(data);
-              data = {result: 'R call succesful'};
-						}
+                console.log(data);
+                data = { result: 'R call succesful' };
+            }
             helpers.formatResponse({ response: data }, req, res);
         }
     );