"could Not Find Class Android.transition.transition" Exception When Pressing Back Button

I have one activity that hosts one fragment at a time, and swaps between two fragments. Fragment A starts Fragment B using a button, and Fragment B starts fragment A either using a

Solution 1:

Kinda late, but I may have something. Not sure what's the cause of this problem, I`ll make some research later, but here in my Project happened the same error after I updated the android-support lib. Using an older version (that was inside HoloEverywhere library) worked normally. Try using an older version of android-support to see if works better. Maybe something went deprecated in a recent version, but I'm not sure.