Engine 4.13.0 2D texture issue

I created a 2D platform game in engine 4.11.2 and when I tried to use the 4.13.0 engine my character textures disappear and I am not able to see the character. Everything was working fine for the 4.11.2 and the 4.12.5 engines. What would have changed in the version to have caused this issue.

I found the problems and got it fixed.

What was the problem? and how did you fix it?