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Java 20 requires Gradle 8, but you have Gradle 7.5.1 which supports at most Java 18 https://docs.gradle.org/current/userguide/compatibility.html#java The error message

Unsupported class file major version 64

is common and I always find it confusing. For some weird reason Java version errors use different numbering to refer to the Java version, so you have to cross reference them https://stackoverflow.com/questions/9170832/list-of-java-class-file-format-major-version-numbers

Even Gradle 8 is not yet 20-compatible as the table you linked to documents. Just as toolchain, not to run Gradle. ;-)

Yes, I am still facing the same issue,

Well, downgrade Java as suggested. ;-)

Downgrade to which version

A compatible one for the Gradle version you use as documented at the link you were given

Java has LTS versions (there are some caveats I’m skipping over). So 20 is the latest but it’s not a LTS version, so not all tools will support it. Instead, try using Java 17, which is a good compromise https://endoflife.date/java

Thanks @Adam @Vampire this worked when i downgraded my Java version