I try add my mod(mavenLocal) to in the dependency, in another my mod:

minecraftLibrary("net.dragonborn:lupin:1.12.4") {
    exclude("net.minecraftforge")
}

And i get exception, when open my screen:

Spoiler

java.lang.NoClassDefFoundError: net/minecraft/client/gui/screens/Screen
    at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?] {}
    at java.lang.ClassLoader.defineClass(ClassLoader.java:1012) ~[?:?] {}
    at cpw.mods.cl.ModuleClassLoader.readerToClass(ModuleClassLoader.java:119) ~[securejarhandler-2.1.4.jar:?] {}
    at cpw.mods.cl.ModuleClassLoader.lambda$findClass$15(ModuleClassLoader.java:219) ~[securejarhandler-2.1.4.jar:?] {}
    at cpw.mods.cl.ModuleClassLoader.loadFromModule(ModuleClassLoader.java:229) ~[securejarhandler-2.1.4.jar:?] {}
    at cpw.mods.cl.ModuleClassLoader.findClass(ModuleClassLoader.java:219) ~[securejarhandler-2.1.4.jar:?] {}
    at cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:135) ~[securejarhandler-2.1.4.jar:?] {}
    at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?] {}
    at cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:137) ~[securejarhandler-2.1.4.jar:?] {}
    at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?] {}

 

that is not how we do it in modern era. you probably found decade old instructions on mc forum...

if your dependency mod is on curseforge or modrinth, just pull it from there. go to curseforge page of your mod, if there is "legacy" prefix in address bar delete it. find the file, click the copy button. paste into dependencies section (where the jei example line is).

if it's not on curseforge/modrinth, use a flat dir dependency (see community wiki).

repositories {
    maven {
        url = "https://www.cursemaven.com"
    }
}

dependencies {
    minecraft '...'
    implementation fg.deobf("curse.maven:SOMETHING:SOMETHING")
}