Forgelin is the only mod I have installed. Here is the error:

[17:57:49] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[17:57:49] [main/INFO]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[17:57:49] [main/INFO]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[17:57:49] [main/INFO]: Forge Mod Loader version 14.23.4.2756 for Minecraft 1.12.2 loading
[17:57:49] [main/INFO]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_51, running on Windows 10:amd64:10.0, installed at D:\myspa\Documents\Curse\Minecraft\Install\runtime\jre-x64\1.8.0_51
[17:57:49] [main/INFO]: Searching D:\myspa\Documents\Curse\Minecraft\Instances\Thaumcraft!\mods for mods
[17:57:49] [main/WARN]: Found FMLCorePluginContainsFMLMod marker in Forgelin-1.7.4.jar. This is not recommended, @mods should be in a separate jar from the coremod.
[17:57:49] [main/WARN]: The coremod net.shadowfacts.forgelin.preloader.ForgelinPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[17:57:49] [main/WARN]: The coremod ForgelinPlugin (net.shadowfacts.forgelin.preloader.ForgelinPlugin) is not signed!
[17:57:49] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[17:57:49] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[17:57:49] [main/INFO]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[17:57:49] [main/INFO]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[17:57:49] [main/INFO]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[17:57:51] [main/INFO]: Found valid fingerprint for Minecraft Forge. Certificate fingerprint e3c3d50c7c986df74c645c0ac54639741c90a557
[17:57:51] [main/INFO]: Found valid fingerprint for Minecraft. Certificate fingerprint cd99959656f753dc28d863b46769f7f8fbaefcfc
[17:57:51] [main/INFO]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[17:57:51] [main/INFO]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[17:57:51] [main/ERROR]: Unable to launch
java.lang.RuntimeException: java.lang.ClassNotFoundException: net.shadowfacts.forgelin.preloader.ForgelinSetup
at net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper.injectIntoClassLoader(CoreModManager.java:168) ~[forge-1.12.2-14.23.4.2756.jar:?]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:115) [launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Caused by: java.lang.ClassNotFoundException: net.shadowfacts.forgelin.preloader.ForgelinSetup
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_51]
at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_51]
at net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper.injectIntoClassLoader(CoreModManager.java:156) ~[forge-1.12.2-14.23.4.2756.jar:?]
... 2 more
Caused by: java.io.FileNotFoundException: D:\myspa\Documents\Curse\Minecraft\Instances\Thaumcraft (The system cannot find the file specified)
at java.util.zip.ZipFile.open(Native Method) ~[?:1.8.0_51]
at java.util.zip.ZipFile.(ZipFile.java:220) ~[?:1.8.0_51]
at java.util.zip.ZipFile.(ZipFile.java:150) ~[?:1.8.0_51]
at java.util.jar.JarFile.(JarFile.java:166) ~[?:1.8.0_51]
at java.util.jar.JarFile.(JarFile.java:103) ~[?:1.8.0_51]
at sun.net.www.protocol.jar.URLJarFile.(URLJarFile.java:93) ~[?:1.8.0_51]
at sun.net.www.protocol.jar.URLJarFile.getJarFile(URLJarFile.java:69) ~[?:1.8.0_51]
at sun.net.www.protocol.jar.JarFileFactory.get(JarFileFactory.java:94) ~[?:1.8.0_51]
at sun.net.www.protocol.jar.JarURLConnection.connect(JarURLConnection.java:122) ~[?:1.8.0_51]
at sun.net.www.protocol.jar.JarURLConnection.getJarFile(JarURLConnection.java:89) ~[?:1.8.0_51]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:145) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_51]
at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_51]
at net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper.injectIntoClassLoader(CoreModManager.java:156) ~[forge-1.12.2-14.23.4.2756.jar:?]
... 2 more
[17:57:51] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]: net.minecraftforge.fml.relauncher.FMLSecurityManager$ExitTrappedException
[17:57:51] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraftforge.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:49)
[17:57:51] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.SecurityManager.checkExit(SecurityManager.java:761)
[17:57:51] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.Runtime.exit(Runtime.java:107)
[17:57:51] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.System.exit(System.java:971)
[17:57:51] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:138)
[17:57:51] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)