added error handling

backend/models/modelToucan.js

@@ -15,6 +15,16 @@ var toucanSchema = new Schema ({
 toucanSchema.index({date:-1},{unique: true});
 
 var toucans = mongoose.model("Toucan",toucanSchema);
-await toucans.updateMany( {},{$set: { toucan_id : 'example'} }, { multi: true });
+try{
+await toucans.updateMany( {},{$set: { toucan_id : 'example'} }, { multi: true }, function (err, docs) {
+    if (err){
+        console.log(err)
+    }
+    else{
+        console.log("Updated Docs : ", docs);
+    }
+});
+}
+catch(e) { console.error(e) };
 
 module.exports = toucans;
\ No newline at end of file