error logout

data class LogoutResponse(
    @SerializedName("error")
    val error: Any,
    @SerializedName("result")
    val logoutResult: Any,
    @SerializedName("status")
    val status: String
)


interface NetworkServices {
    @DELETE("auth/logout")
    fun logout(@Header("Authorization") Authorization:String): Call<LogoutResponse>
}


class ProfileFragment : Fragment() {
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        view.tv_logout.setOnClickListener {
            retrofit()
            callback.onFragmentChange(BeforeLoginFragment())
        }
    }

    private fun retrofit() {
        val pref = context?.getSharedPreferences(NavigationActivity.MY_PREFS_NAME, Context.MODE_PRIVATE)
        val editor = context?.getSharedPreferences(NavigationActivity.MY_PREFS_NAME,Context.MODE_PRIVATE)!!.edit()

        var token = "belum"
        if (pref != null) token = pref.getString("tokenLogin", "belum").toString()

        val callback = MainApps().services.logout(token)

        callback.enqueue(object : Callback<LogoutResponse> {
            override fun onResponse(call: Call<LogoutResponse>, response: Response<LogoutResponse>) {

//      .......................errorr di sekitar sini.......................
                if (response.isSuccessful) {
                    editor.putString("tokenLogin","belum")
                    editor.apply()
                    val intent = Intent(context, NavigationActivity::class.java)
                    startActivity(intent)
                }
                else{
                }
            }
            override fun onFailure(call: Call<LogoutResponse>, t: Throwable) {
            }
//      .......................errorr di sekitar sini.......................

        })
    }
}


..............................................Error..............................................

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.jokot.lakon, PID: 25407
    java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference
        at android.content.ComponentName.<init>(ComponentName.java:128)
        at android.content.Intent.<init>(Intent.java:4900)
        at com.example.jokot.lakon.fragment.profile.ProfileFragment$retrofit$1.onResponse(ProfileFragment.kt:82)
        at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:70)
        at android.os.Handler.handleCallback(Handler.java:751)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6169)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:891)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:781)