wireguard android library - Error UAPIOpen: ... permission denied

Question

I'm trying to make android WireGuard client using com.wireguard.android:tunnel library.

• Client platform: Android
• Library: com.wireguard.android:tunnel (1.0.20211029)
• My app package name: com.example.hellowireguard
• Test devices: Nexus 5X
• WireGuard server: ubuntu 20.04

When trying to connect, I got this error. But, the connection appears to be working fine.

E/WireGuard/GoBackend/abc: UAPIOpen: mkdir /data/data/com.wireguard.android: permission denied

Can this error be ignored?