Gradle "Build failed with an exception."

[ni-cky]

Hi! I tried to rebuild my project after inserting an accesswidener and now this error message is coming up when I do

gradlew eclipse

> Configure project :
Fabric Loom: 0.8.21

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'com.nicky.grisha'.
> Failed to notify project evaluation listener.
   > Failed to provide net.fabricmc:yarn:1.17.1+build.31 : java.lang.RuntimeException: Invalid line ( )
   > Cannot invoke "net.fabricmc.loom.configuration.providers.minecraft.MinecraftMappedProvider.getMappedJar()" because "mappingsProvider.mappedProvider" is null

* 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 6s

gradle.build

	id 'fabric-loom' version '0.8-SNAPSHOT'
	id 'maven-publish'
}

sourceCompatibility = JavaVersion.VERSION_16
targetCompatibility = JavaVersion.VERSION_16

archivesBaseName = project.archives_base_name
version = project.mod_version
group = project.maven_group



repositories {
	// Add repositories to retrieve artifacts from in here.
	// You should only use this when depending on other mods because
	// Loom adds the essential maven repositories to download Minecraft and libraries from automatically.
	// See https://docs.gradle.org/current/userguide/declaring_repositories.html
	// for more information about repositories.
	maven {
        name = "CottonMC"
        url = "https://server.bbkr.space/artifactory/libs-release"
    }
}

dependencies {
    minecraft "com.mojang:minecraft:1.17.1"
    mappings "net.fabricmc:yarn:1.17.1+build.31:v2"
    modImplementation "net.fabricmc:fabric-loader:0.11.6"
            
    //Fabric api
    modImplementation "net.fabricmc.fabric-api:fabric-api:0.37.1+1.17"
}

processResources {
	inputs.property "version", project.version

	filesMatching("fabric.mod.json") {
		expand "version": project.version
	}
}

tasks.withType(JavaCompile).configureEach {
	// ensure that the encoding is set to UTF-8, no matter what the system default is
	// this fixes some edge cases with special characters not displaying correctly
	// see http://yodaconditions.net/blog/fix-for-java-file-encoding-problems-with-gradle.html
	// If Javadoc is generated, this must be specified in that task too.
	it.options.encoding = "UTF-8"

	// Minecraft 1.17 (21w19a) upwards uses Java 16.
	it.options.release = 16
}

java {
	// Loom will automatically attach sourcesJar to a RemapSourcesJar task and to the "build" task
	// if it is present.
	// If you remove this line, sources will not be generated.
	withSourcesJar()
}

minecraft {
		accessWidener "src/main/resources/grisha/accesswidener/grishamaterialkicraftingrecipe.accesswidener"
	}

jar {
	from("LICENSE") {
		rename { "${it}_${project.archivesBaseName}"}
	}
}

// configure the maven publication
publishing {
	publications {
		mavenJava(MavenPublication) {
			// add all the jars that should be included when publishing to maven
			artifact(remapJar) {
				builtBy remapJar
			}
			artifact(sourcesJar) {
				builtBy remapSourcesJar
			}
		}
	}

	// See https://docs.gradle.org/current/userguide/publishing_maven.html for information on how to set up publishing.
	repositories {
		// Add repositories to publish to here.
		// Notice: This block does NOT have the same function as the block in the top level.
		// The repositories here will be used for publishing your artifact, not for
		// retrieving dependencies.
	}
	
	
}

gradle.properties

org.gradle.jvmargs=-Xmx1G

# Fabric Properties
	# check these on https://fabricmc.net/versions.html
	minecraft_version=1.17.1
	yarn_mappings=1.17.1+build.31
	loader_version=0.11.6

# Mod Properties
	mod_version = 1.0.0
	maven_group = com.nicky
	archives_base_name = grisha

# Dependencies
	fabric_version=0.37.1+1.17

[warjort]

I would post this as an issue in fabric-loom:
https://github.com/FabricMC/fabric-loom/issues
It should at least give you a better error message than an NPE. :-)

You probably also want to include your accesswidener since that is what you changed.
And run gradle with --stacktrace to get the full context of the error.

Anyway, since this is an error related to mappings and the thing you changed is the accesswidener (aw) you should check the first line of the aw has a valid mappings name, e.g.:

accessWidener v1 named

[warjort]

   > Failed to provide net.fabricmc:yarn:1.17.1+build.31 : java.lang.RuntimeException: Invalid line ( )

This error suggests the yarn mappings file is corrupted? Again --stacktrace might give more context.

[warjort]

You might also try an earlier build of yarn, e.g. build.30 to see if you get the same problem.

[ni-cky]

Thanks for the help. I joined the fabric discord and was helped there. Apparently there was a looming blank line with a whitespace that messed up the accesswidener file.