Problem with example

[Blandss]

Hi, I'm using public repositories for the first time in a long time and I can't solve this problem:

[16:29:21 ERROR]: [modmenu] Failed to register events for class com.blandplugins.ModMenu.BanInventory because net/wesjd/anvilgui/AnvilGUI$StateSnapshot does not exist.

There is my code:

            } else if (clickedItem.getItemMeta().getDisplayName().equals("§f§lBETA §c§lWybierz inną konfigurację kary")) {
                // Otwieranie kowadła dla gracza
                new AnvilGUI.Builder()
                    .onClose(stateSnapshot -> {
                        stateSnapshot.getPlayer().sendMessage("You closed the inventory.");
                    })
                    .onClick((slot, stateSnapshot) -> {
                        if(slot != AnvilGUI.Slot.OUTPUT) {
                            return Collections.emptyList();
                        }

                        if(stateSnapshot.getText().equalsIgnoreCase("you")) {
                            stateSnapshot.getPlayer().sendMessage("You have magical powers!");
                            return Arrays.asList(AnvilGUI.ResponseAction.close());
                        } else {
                            return Arrays.asList(AnvilGUI.ResponseAction.replaceInputText("Try again"));
                        }
                    })
                    .preventClose()                                                    //prevents the inventory from being closed
                    .text("What is the meaning of life?")                              //sets the text the GUI should start with
                    .title("Enter your answer.")                                       //set the title of the GUI (only works in 1.14+)
                    .plugin(plugin)                                          //set the plugin instance
                    .open(player);  
            }
            
And pom.xml:

	<repositories>
		<!-- This adds the Spigot Maven repository to the build -->
		<repository>
			<id>spigot-repo</id>
			<url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
		</repository>
	<repository>
		<id>codemc-snapshots</id>
		<url>https://repo.codemc.io/repository/maven-snapshots/</url>
	</repository>
	</repositories>
	
		<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.11</version>
			<scope>test</scope>
		</dependency>
		<!--This adds the Spigot API artifact to the build -->
		<dependency>
			<groupId>org.spigotmc</groupId>
			<artifactId>spigot-api</artifactId>
			<version>1.20.1-R0.1-SNAPSHOT</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>net.wesjd</groupId>
			<artifactId>anvilgui</artifactId>
			<version>1.9.0-SNAPSHOT</version>
		</dependency>
	</dependencies>