Installation problem on laravel-admin 1.8

[taha-moghaddam]

When I try to install it on laravel-admin version 1.8 I get this error

Problem 1
    - laravel-admin-ext/log-viewer v1.0 requires laravel/framework 5.5.*
    - laravel-admin-ext/log-viewer[v1.0.1, v1.0.2] require laravel/framework ~5.5
    - laravel-admin-ext/log-viewer[v1.0.3, v1.0.4] require encore/laravel-admin ~1.6
    - Root composer.json requires laravel-admin-ext/log-viewer ^1.0 -> satisfiable by laravel-admin-ext/log-viewer[v1.0, v1.0.1, v1.0.2, v1.0.3, v1.0.4].