Minecraft Forge (1.7.10) always crashes?

I have the problem Minecraft Forge (1.7.10) always crashes when starting.
I only have one mod on it, namely techguns.

I would be happy for help.

I will insert the crash report here:

---- Minecraft Crash Report ----

// Daisy, daisy…

Time: 30.06.20 08:15

Description: There was a severe problem during mod loading that has caused the game to fail

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: techguns / items / OreClusterScanner

at cpw.mods.fml.common.LoadController.transition (LoadController.java:163)

at cpw.mods.fml.common.Loader.preinitializeMods (Loader.java:559)

at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading (FMLClientHandler.java:243)

at net.minecraft.client.Minecraft.func_71384_a (Minecraft.java:480)

at net.minecraft.client.Minecraft.func_99999_d (Minecraft.java:878)

at net.minecraft.client.main.Main.main (SourceFile: 148)

at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke (Method.java:497)

at net.minecraft.launchwrapper.Launch.launch (Launch.java:135)

at net.minecraft.launchwrapper.Launch.main (Launch.java:28)

Is on the mod side of errors. XD

You also need these mods:

Chisel (1.7.10 version): http://minecraft.curseforge.com/...cts/chisel - chisel API is implemented by some blocks and connected texture library is used. (Use this version: https://minecraft.curseforge.com/...s/2287442)

Cofhlib (http://minecraft.curseforge.com/projects/cofh-lib) - for RF API

Or you install the mod for the 1.12 which no longer needs anything.

Thank you for your help.