get an error ( net/wesjd/anvilgui/AnvilGUI$Response does not exist.)

[Nontage]

this is my maven

4.0.0

<groupId>com.nontage</groupId>
<artifactId>Guild</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>



<name>Guild</name>

<properties>
    <java.version>1.8</java.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.8.1</version>
            <configuration>
                <source>8</source>
                <target>8</target>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>3.2.4</version>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <createDependencyReducedPom>false</createDependencyReducedPom>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
    <resources>
        <resource>
            <directory>src/main/resources</directory>
            <filtering>true</filtering>
        </resource>
    </resources>
</build>

<repositories>
    <repository>
        <id>spigotmc-repo</id>
        <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
    </repository>
    <repository>
        <id>sonatype</id>
        <url>https://oss.sonatype.org/content/groups/public/</url>
    </repository>
    <repository>
        <id>codemc-snapshots</id>
        <url>https://repo.codemc.io/repository/maven-snapshots/</url>
    </repository>
</repositories>

<dependencies>
    <dependency>
        <groupId>org.spigotmc</groupId>
        <artifactId>spigot-api</artifactId>
        <version>1.20.1-R0.1-SNAPSHOT</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
        <version>2.8.8</version>
    </dependency>
    <dependency>
        <groupId>net.wesjd</groupId>
        <artifactId>anvilgui</artifactId>
        <version>1.6.0-SNAPSHOT</version>
    </dependency>
</dependencies>

[Wesley Smith]

Search issue history. There are countless examples on how to fix this. You need to shade the library correctly.