Custom Minecraft Launcher error.

[Kazzookay]

Hey ! I don't know if my post is in the right topic theme, but I really need your help...

I've made a custom MC Launcher, and when I'm trying to launch the game, I've an error.

 

Here's all the logs : 

[16:50:14] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker

[16:50:14] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker

[16:50:14] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker

[16:50:14] [main/INFO] [FML]: Forge Mod Loader version 7.99.40.1614 for Minecraft 1.7.10 loading

[16:50:14] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_261, running on Windows 10:amd64:10.0, installed at C:\Program Files\Java\jre1.8.0_261

[16:50:14] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

[16:50:14] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker

[16:50:14] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

[16:50:14] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

[16:50:14] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper

[16:50:24] [main/INFO] [FML]: Found valid fingerprint for Minecraft Forge. Certificate fingerprint e3c3d50c7c986df74c645c0ac54639741c90a557

[16:50:24] [main/INFO] [FML]: Found valid fingerprint for Minecraft. Certificate fingerprint cd99959656f753dc28d863b46769f7f8fbaefcfc

[16:50:24] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper

[16:50:24] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLDeobfTweaker

[16:50:25] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.TerminalTweaker

[16:50:25] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.TerminalTweaker

[16:50:25] [main/INFO] [LaunchWrapper]: Launching wrapped minecraft {net.minecraft.client.main.Main}

[16:50:26] [main/ERROR] [LaunchWrapper]: Unable to launch
java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_261]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_261]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_261]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_261]
        at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
        at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Caused by: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 3
        at com.google.gson.Gson.fromJson(Gson.java:815) ~[Gson.class:?]
        at com.google.gson.Gson.fromJson(Gson.java:768) ~[Gson.class:?]
        at com.google.gson.Gson.fromJson(Gson.java:717) ~[Gson.class:?]
        at net.minecraft.client.main.Main.main(SourceFile:116) ~[Main.class:?]
        ... 6 more
Caused by: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 3
        at com.google.gson.stream.JsonReader.beginArray(JsonReader.java:338) ~[JsonReader.class:?]
        at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:172) ~[MapTypeAdapterFactory$Adapter.class:?]
        at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:145) ~[MapTypeAdapterFactory$Adapter.class:?]
        at com.google.gson.Gson.fromJson(Gson.java:803) ~[Gson.class:?]
        at com.google.gson.Gson.fromJson(Gson.java:768) ~[Gson.class:?]
        at com.google.gson.Gson.fromJson(Gson.java:717) ~[Gson.class:?]
        at net.minecraft.client.main.Main.main(SourceFile:116) ~[Main.class:?]
        ... 6 more

Exception in thread "main"
[16:50:27] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: cpw.mods.fml.relauncher.FMLSecurityManager$ExitTrappedException
[16:50:27] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:   at cpw.mods.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:25)
[16:50:27] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:   at java.lang.SecurityManager.checkExit(Unknown Source)
[16:50:27] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:   at java.lang.Runtime.exit(Unknown Source)
[16:50:27] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:   at java.lang.System.exit(Unknown Source)
[16:50:27] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:   at net.minecraft.launchwrapper.Launch.launch(Launch.java:138)
[16:50:27] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:   at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

 

Using :

- Node.JS ,

- Electron Framework,

- and "minecraft-launcher-core".

(MLC version : 3.14.6)

 

Please help me, i need to send this launcher to a friend...

 

- Kazzookay.

[diesieben07]

1. Do not make your own launcher.
2. 1.7.10 is no longer supported.

[Kazzookay]

9 minutes ago, diesieben07 said:

1. Do not make your own launcher.
2. 1.7.10 is no longer supported.

Hmm. Thanks, but I make my own launcher if I want.

[diesieben07]

Please be aware that making users enter their Mojang credentials into your own software is potentially against the Minecraft EULA and definitely against Mojang's wishes.

[Kazzookay]

20 minutes ago, diesieben07 said:

Please be aware that making users enter their Mojang credentials into your own software is potentially against the Minecraft EULA and definitely against Mojang's wishes.

 

- AZ Launcher,

- Pactify Launcher,

- Badlion Client,

- FTB Launcher, 

- MultiMC

- T-Launcher...

 

Go to their forums and tell them "It's not legal !".

[diesieben07]

Nope, not going to. Not my job. Also "others are doing illegal things, so it's not illegal" is not an argument.

Also note, at least two of the ones you listed (TLauncher and Badlion) allow you to pirate the game, which is a bannable offense on this forum.

 

I am going to lock this now, end of discussion.