Reload a file where you were next to Esbern then escort him out of the rat way and fast travel to river wood where he should be at its main entrance by the smith. If he doesn't appear, wait and check inside the inn as he may spawn inside.
A true ninja will wait and train to become even better. Making a fake enemy isn't a good option and would cause troubles. Patience is the ninja's virtue.
Problem: You fast-travelled, which therefore caused an error in your game, and it is now unable to be completed. Do not leave the area until you've completed the trials. Check...
Download it again and go to settings and click delete. If that does not work, you may have to factory reset or restart your phone. If that doesn't work, then...
Make sure the text is entered exactly as described. It's likely that you have a space in front of one of the names, where there should only be a single...