ClassNotFoundException: Didn't find class

[USTCerirl]

Hi there, I m new to frida and I wanna try my first frida hook to log out "Hello Frida!", but every method I wanna hook will throw this exception, I have no idea wut to do rn. can anyone help me? I d appreciate it！

This is the frida frag I copy from jadx:
let StartActivity = Java.use("com.e4a.runtime.android.StartActivity");
StartActivity["onCreate"].implementation = function (bundle) {
console.log(StartActivity.onCreate is called: bundle=${bundle});
console.log('Hello Frida');
this"onCreate";
};

This is the command I type in cmd: frida -U -l hello.js -f com.example.lof (cuz I try to hook a oncreate method, so I try to start it in spawn mode.)

This is the result I get:
Error: java.lang.ClassNotFoundException: Didn't find class "com.e4a.runtime.android.StartActivity" on path: DexPathList[[directory "."],nativeLibraryDirectories=[/system/lib64, /system/vendor/lib64, /system/lib64, /system/vendor/lib64]]
at (frida/node_modules/frida-java-bridge/lib/env.js:124)
at (frida/node_modules/frida-java-bridge/lib/env.js:115)
at apply (native)
at (frida/node_modules/frida-java-bridge/lib/env.js:97)
at (frida/node_modules/frida-java-bridge/lib/class-factory.js:488)
at value (frida/node_modules/frida-java-bridge/lib/class-factory.js:945)
at value (frida/node_modules/frida-java-bridge/lib/class-factory.js:950)
at _make (frida/node_modules/frida-java-bridge/lib/class-factory.js:165)
at use (frida/node_modules/frida-java-bridge/lib/class-factory.js:62)
at use (frida/node_modules/frida-java-bridge/index.js:258)
at main (D:\Desktop\frida_demo\hello.js:2)
at apply (native)
at (frida/runtime/core.js:51)

[1trackprojects1]

I'm getting the same issue, anyone else?

Update: FIXED IT!!! - basically just wrap your code around with another function like this:

Java.perform(function () {
    // code here
});