Hey ! Iam using 4.26 and it requires android studio and vs community 2019. i have same problem yesterday. 3 times i make my project from beginning again and again. but finally i know that makes UE4 gradle error. the visual studio and android studio did auto update. so what i did is :
- deleteing Intermediate Folder
- deleting Saved Folder
- [Important] Deleteing Binaries Folder
and last. rebuild project.
and it works HAHA i dont need to make a project from beginning and recode it again.
hope it will help 
thanks !