I am currently working on a Java project (jdk-18.0.2.1; Gradle DSL: Groovy; Gradle Distribution: Wrapper; Gradle version 8.5) and want to use the following repositories and dependencies

repositories {
    mavenCentral()
    maven {
        url "https://repo.craftsblock.de/releases"
    }
}

dependencies {
    implementation 'net.minecraftforge:forgespi:' + spi_version
    implementation "de.craftsblock.craftscore:CraftsCore:3.7.49-SNAPSHOT"
}

in my build.gradle.
When I build the project I get this error:
Code Picture

I tried changing the used Java version in the project. But for 17/18/22 I get the same result.