Task :compileJava FAILED

I just started to making my own mod, but when I wanted to check how it works, I got the message: 

FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':compileJava'.
> Could not resolve all files for configuration ':compileClasspath'.
> Could not find net.minecraftforge:forge:1.20.1-47.3.0_mapped_official_1.20.1.
Searched in the following locations:
- file:/C:/Users/User1/.mcreator/gradle/caches/forge_gradle/bundeled_repo/net/minecraftforge/forge/1.20.1-47.3.0_mapped_official_1.20.1/forge-1.20.1-47.3.0_mapped_official_1.20.1.pom

- file:/C:/Users/User1/.mcreator/gradle/caches/forge_gradle/bundeled_repo/net/minecraftforge/forge/1.20.1-47.3.0_mapped_official_1.20.1/forge-1.20.1-47.3.0_mapped_official_1.20.1.jar
Required by:
project :
* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at https://help.gradle.org.
BUILD FAILED in 22s


I even tryied to make this folders and add forge-1.20.1-47.3.0_mapped_official_1.20.1.jar and 1.20.1-47.3.0_mapped_official_1.20.1/forge-1.20.1-47.3.0_mapped_official_1.20.1.pom by my self, but it did not work either!
I researched many orher forums but it also did not help.
I hope that someone who know how to deal with this error will help me and others with this error.

p.s sorry for my bad english