I’m trying to do a pull request on github, but when I push all from git, the pull request says that gradle build failed. That are the details:

Run ./gradlew build
Downloading https……
………..10%…………20%…………30%…………40%…………50%…………60%………..70%…………80%…………90%…………100%

Welcome to Gradle 8.0.2!

Here are the highlights of this release:

• Improvements to the Kotlin DSL
• Fine-grained parallelism from the first build with configuration cache
• Configurable Gradle user home cache cleanup

Starting a Gradle Daemon (subsequent builds will be faster)

Task :compileJava FAILED
1 actionable task: 1 executed
/home/runner/work/progetto-blum/progetto-blum/src/main/java/it/uniba/app/Tavoliere.java:1: error: illegal character: ‘ufeff’
package it.uniba.app;
^
/home/runner/work/progetto-blum/progetto-blum/src/main/java/it/uniba/app/Tavoliere.java:1: error: class, interface, enum, or record expected
package it.uniba.app;
^
2 errors

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ‘:compileJava’.

Compilation failed; see the compiler error output for details.

• 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.

BUILD FAILED in 18s
Error: Process completed with exit code 1.

Anyone know how to resolve this problem? Or what this problem means?