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Hi guys, I encounter the very same issue. Attached you can find the logs (java.lang.IllegalArgumentException: object is not an instance of declaring class) Thanks a lot! [B#353] 2017/10/07 12:48:16 [INFO] OS: mac os x [B#353] 2017/10/07 12:48:16 [INFO] Identified as osx [B#353] 2017/10/07 12:48:16 [SEVERE] java.lang.IllegalArgumentException: object is not an instance of declaring class [B#353] 2017/10/07 12:48:16 [SEVERE] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [B#353] 2017/10/07 12:48:16 [SEVERE] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) [B#353] 2017/10/07 12:48:16 [SEVERE] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) [B#353] 2017/10/07 12:48:16 [SEVERE] at java.base/java.lang.reflect.Method.invoke(Unknown Source) [B#353] 2017/10/07 12:48:16 [SEVERE] at net.technicpack.launcher.LauncherMain.startLauncher(LauncherMain.java:299) [B#353] 2017/10/07 12:48:16 [SEVERE] at net.technicpack.launcher.LauncherMain.main(LauncherMain.java:194) [B#353] 2017/10/07 12:48:16 [SEVERE] Unhandled Exception in Thread[main,5,main] java.lang.IllegalArgumentException: object is not an instance of declaring class at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.base/java.lang.reflect.Method.invoke(Unknown Source) at net.technicpack.launcher.LauncherMain.startLauncher(LauncherMain.java:299) at net.technicpack.launcher.LauncherMain.main(LauncherMain.java:194)