My 1.8.9 forge isn't working 
01:39:13.832
launcher
main
Couldn't fetch SHA1 checksum for http://files.minecraftforge.net/maven/org/scala-lang/scala-library/2.11.1/scala-library-2.11.1.jar
01:39:13.833
launcher
main
Have local file C:\Users\aleke\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-library\2.11.1\scala-library-2.11.1.jar but don't know what size or hash it should be. Have to assume it's good.
01:39:13.893
launcher
main
Couldn't fetch SHA1 checksum for http://files.minecraftforge.net/maven/org/scala-lang/plugins/scala-continuations-plugin_2.11.1/1.0.2/scala-continuations-plugin_2.11.1-1.0.2.jar
01:39:13.894
launcher
main
Have local file C:\Users\aleke\AppData\Roaming\.minecraft\libraries\org\scala-lang\plugins\scala-continuations-plugin_2.11.1\1.0.2\scala-continuations-plugin_2.11.1-1.0.2.jar but don't know what size or hash it should be. Have to assume it's good.
01:39:13.894
launcher
main
Couldn't fetch SHA1 checksum for http://files.minecraftforge.net/maven/org/scala-lang/scala-parser-combinators_2.11/1.0.1/scala-parser-combinators_2.11-1.0.1.jar
01:39:13.895
launcher
main
Have local file C:\Users\aleke\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-parser-combinators_2.11\1.0.1\scala-parser-combinators_2.11-1.0.1.jar but don't know what size or hash it should be. Have to assume it's good.
01:39:13.958
launcher
main
Couldn't fetch SHA1 checksum for http://files.minecraftforge.net/maven/org/scala-lang/scala-reflect/2.11.1/scala-reflect-2.11.1.jar
01:39:13.960
launcher
main
Have local file C:\Users\aleke\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-reflect\2.11.1\scala-reflect-2.11.1.jar but don't know what size or hash it should be. Have to assume it's good.
01:39:13.960
launcher
main
Couldn't fetch SHA1 checksum for http://files.minecraftforge.net/maven/org/scala-lang/scala-swing_2.11/1.0.1/scala-swing_2.11-1.0.1.jar
01:39:13.961
launcher
main
Have local file C:\Users\aleke\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-swing_2.11\1.0.1\scala-swing_2.11-1.0.1.jar but don't know what size or hash it should be. Have to assume it's good.
01:39:13.983
launcher
main
Couldn't fetch SHA1 checksum for http://files.minecraftforge.net/maven/org/scala-lang/scala-xml_2.11/1.0.2/scala-xml_2.11-1.0.2.jar
01:39:13.985
launcher
main
Have local file C:\Users\aleke\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-xml_2.11\1.0.2\scala-xml_2.11-1.0.2.jar but don't know what size or hash it should be. Have to assume it's good.
01:39:14.212
launcher
main
Checking installations.
01:39:14.215
launcher
main
Minecraft client 1.8.9-forge1.8.9-11.15.1.1722 is ready to start.
01:39:14.216
launcher
main
Starting!
01:39:14.352
launcher
main
Using default game log configuration client-1.7.xml (outputs XML)
01:39:15.407
LaunchWrapper
main
Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
01:39:15.427
LaunchWrapper
main
Unable to launch java.lang.ClassNotFoundException: net.minecraftforge.fml.common.launcher.FMLTweaker at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:348) at net.minecraft.launchwrapper.Launch.launch(Launch.java:98) at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
01:39:15.462
launcher
main
 
01:39:15.462
monitor
Process Monitor
Process crashed with exit code 1
those are the logs if someone knows how to fix this please tell me