Alliance war error

In alliance war i am facing a bug i can place my heroes for alliance defense but i am unable to enter map for alliance war attack phase when ever i try to enter in any battlegroup it shows me this


Device: infinix hot 10
Device operating system: android 10
Network: mobile data (zong sim)
Game version: 40.1.1

Please help me with this problem this happened to me after alliance war new update previous i ignored it but the problem is showing up again if this continues i would not be able to participate in alliance war.