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.

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.

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 !".