Pixelmon wont open please help

[Gaiaphage1243]

My friend is having issues opening her pixelmon she has everything updated but when she clicks play it starts trying to open the  just goes back to the launcher home. https://pastebin.com/kxmLhp3t here's the logs

[JaariAtmc]

Go google what this error means: Unsupported major.minor version 52.0