Without clearing ''AppData > Roaming > .minecraft > mods" :
at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.0/cpw.mods.modlauncher.ModuleLayerHandler.buildLayer(ModuleLayerHandler.java:70)
at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.0/cpw.mods.modlauncher.ModuleLayerHandler.buildLayer(ModuleLayerHandler.java:82)
at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.0/cpw.mods.modlauncher.TransformationServicesHandler.discoverServices(TransformationServicesHandler.java:128)
at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.0/cpw.mods.modlauncher.Launcher.run(Launcher.java:86)
at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.0/cpw.mods.modlauncher.Launcher.main(Launcher.java:77)
at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.0/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26)
at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.0/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23)
at cpw.mods.bootstraplauncher@1.0.0/cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:149)
Process crashed with exit code 1
After clearing ''AppData > Roaming > .minecraft > mods" was everything ok again