i can't use okhttp3 with okio

[try2020-code]

im sure i already use the pkg to my project l
<MavenReference Include="com.squareup.okio:okio" Version="3.6.0" />

but its didn't working,

and then

Decompile the jar and find that it has no classes

there have not any code , i need help

[try2020-code]

I found out that this okio package is written in Kotlin