Is anyone familiar with using antlr4 and able to figure this out?

[stable maple]

I am trying to use antlr4 to create a java translator program that will process variable declarations and then create symbol tables out of them, but so far I haven't been able to get around a few "package" related errors and I'm really unsure how to correct them, here are the files i'm trying to use, i would really appreciate an answer ASAP thank you (also i know it says format code in triple backticks but i reached the space limit so i had to make them text files sorry)

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[jovial warren]

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<@&765578700724371486>

Requested by EpicJake#9004

[queen yew]

what kind of package errors

what's the issue specifically

[stable maple]

Driver.java:8: error: package antlr_gen does not exist
antlr_gen.LittleLexer lexer = new antlr_gen.LittleLexer(input);
^
Driver.java:8: error: package antlr_gen does not exist
antlr_gen.LittleLexer lexer = new antlr_gen.LittleLexer(input);
^
Driver.java:10: error: package antlr_gen does not exist
antlr_gen.LittleParser parser = new antlr_gen.LittleParser(tokens);
^
Driver.java:10: error: package antlr_gen does not exist
antlr_gen.LittleParser parser = new antlr_gen.LittleParser(tokens);
^
Note: Driver.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
4 errors

these are the errors i'm facing

idk how to get around them

what's wrong with the driver code or whatever

[queen yew]

the generated antlr files are probably not on the compile classpath

[stable maple]

Huh

Wdym?

are there some kinda files it's not generating or something?

or that it's meant to be

[jovial warren]

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[queen yew]

how does your package structure look

like what folder is where with which files