if you have another fb account just switch into it then the opening dialog comes up at the top left of your screen there's an icon which you can log in via fb/google ofc choose fb then switch to your main account That's what i always do if i got Error
1.Dont use Facebook apps..
2.Go to File Android/obb and Android/data Find
com.hoolai.dragonest.slimeasean.gp
Change File Name example = com.hoolai.dragonest.slimeasean.gp.1
3.Go to apps Clear data and Clear Cache
4.Rename The obb and data to normal
5.Enjoy
1.Dont use Facebook apps..
2.Go to File Android/obb and Android/data Find
com.hoolai.dragonest.slimeasean.gp
Change File Name example = com.hoolai.dragonest.slimeasean.gp.
1
3.Delete App and reinstall it
4.Rename The obb and data to normal