Crash presumably caused by outdated mods?

[Falkner35]

http://pastebin.com/nZsDH5aq - minecraft log

http://pastebin.com/t1gS41Df - Forge Log

I'm in the process of building a modpack, and I keep crashing very quickly after launch. Looking it up tells me something, either forge or the mods I am using are outdated, but both of them are for 1.7.10 so I need some help pinning down the exact issue.

[Choonster]

[17:32:49] [main/DEBUG] [FML/]: Examining for coremod candidacy OpenComputers-MC1.8.9-1.5.21.1.jar

[17:32:49] [main/TRACE] [FML/]: Found FMLCorePluginContainsFMLMod marker in OpenComputers-MC1.8.9-1.5.21.1.jar, it will be examined later for regular @Mod instances

[17:32:49] [main/DEBUG] [FML/]: Instantiating coremod class TransformerLoader

[17:32:49] [main/INFO] [sTDERR/]: [java.lang.Throwable$WrappedPrintStream:println:-1]: java.lang.NoClassDefFoundError: net/minecraftforge/fml/relauncher/IFMLLoadingPlugin

 

You have a coremod built for 1.8+ installed (OpenComputers).