Why is my URL vacant?

Hi, so I’ve revisited the writing a space-admin screen tutorial which can be found here: https://developer.atlassian.com/server/confluence/writing-a-space-admin-screen/

I’m getting this new error which basically says that my url is vacant. The error that I’m having can be found here https://confluence.atlassian.com/confkb/confluence-states-there-is-no-action-mapped-for-namespace-x-and-action-name-x-296911093.html?utm_medium=logScan&utm_source=STP

Below is an excerpt of my atlassian-confluence.log with what I believe is the error:

2020-07-17 10:40:43,649 DEBUG [361:StdOutHandler [C:\Program Files\Java\jdk1.8.0_251\jre\bin\java.exe]] [plugins.synchrony.bootstrap.LoggingOutputHandler] processLine 2020-07-17 14:40:43,649 ERROR [main] [synchrony.logging] uncaught exception {:throwable #error {
2020-07-17 10:40:43,650 DEBUG [361:StdOutHandler [C:\Program Files\Java\jdk1.8.0_251\jre\bin\java.exe]] [plugins.synchrony.bootstrap.LoggingOutputHandler] processLine :cause "Address already in use: bind"
2020-07-17 10:40:43,650 DEBUG [361:StdOutHandler [C:\Program Files\Java\jdk1.8.0_251\jre\bin\java.exe]] [plugins.synchrony.bootstrap.LoggingOutputHandler] processLine :via
2020-07-17 10:40:43,650 DEBUG [361:StdOutHandler [C:\Program Files\Java\jdk1.8.0_251\jre\bin\java.exe]] [plugins.synchrony.bootstrap.LoggingOutputHandler] processLine [{:type clojure.lang.ExceptionInfo
2020-07-17 10:40:43,650 DEBUG [361:StdOutHandler [C:\Program Files\Java\jdk1.8.0_251\jre\bin\java.exe]] [plugins.synchrony.bootstrap.LoggingOutputHandler] processLine :message "error while starting state #'synchrony.server.http-server/http-server"
2020-07-17 10:40:43,650 DEBUG [361:StdOutHandler [C:\Program Files\Java\jdk1.8.0_251\jre\bin\java.exe]] [plugins.synchrony.bootstrap.LoggingOutputHandler] processLine :data {:var #'synchrony.server.http-server/http-server}
2020-07-17 10:40:43,650 DEBUG [361:StdOutHandler [C:\Program Files\Java\jdk1.8.0_251\jre\bin\java.exe]] [plugins.synchrony.bootstrap.LoggingOutputHandler] processLine :at [mount.lite$start$fn__24142 invoke "lite.clj" 153]}
2020-07-17 10:40:43,650 DEBUG [361:StdOutHandler [C:\Program Files\Java\jdk1.8.0_251\jre\bin\java.exe]] [plugins.synchrony.bootstrap.LoggingOutputHandler] processLine {:type java.net.BindException
2020-07-17 10:40:43,650 DEBUG [361:StdOutHandler [C:\Program Files\Java\jdk1.8.0_251\jre\bin\java.exe]] [plugins.synchrony.bootstrap.LoggingOutputHandler] processLine :message "Address already in use: bind"
2020-07-17 10:40:43,650 DEBUG [361:StdOutHandler [C:\Program Files\Java\jdk1.8.0_251\jre\bin\java.exe]] [plugins.synchrony.bootstrap.LoggingOutputHandler] processLine :at [sun.nio.ch.Net bind0 "Net.java" -2]}]
2020-07-17 10:40:43,650 DEBUG [361:StdOutHandler [C:\Program Files\Java\jdk1.8.0_251\jre\bin\java.exe]] [plugins.synchrony.bootstrap.LoggingOutputHandler] processLine :trace

I am so very confused.

Below I’ve also included my atlassian-plugin.xml which I think might help.

<atlassian-plugin key="${atlassian.plugin.key}" name="${project.name}" plugins-version="2">
<plugin-info>
<description>${project.description}</description>
<version>${project.version}</version>
<vendor name="${project.organization.name}" url="${project.organization.url}" />
<param name="plugin-icon">images/pluginIcon.png</param>
<param name="plugin-logo">images/pluginLogo.png</param>
</plugin-info>

<!-- add our i18n resource -->
<resource type="i18n" name="i18n" location="sdkversiontest"/>

<!-- add our web resources -->
<web-resource key="sdkversiontest-resources" name="sdkversiontest Web Resources">
<dependency>com.atlassian.auiplugin:ajs</dependency>

<resource type="download" name="sdkversiontest.css" location="/css/sdkversiontest.css"/>
<resource type="download" name="sdkversiontest.js" location="/js/sdkversiontest.js"/>
<resource type="download" name="images/" location="/images"/>

<context>sdkversiontest</context>
</web-resource>

<!-- Item in Space Tools -->
<web-item key="space-admin-quick-link-manager" name="Quick Link Manager in Space Admin" section="system.space.tools/addons" weight="100">
<label key="space.admin.quick.link.manager" />
<link linkId="space-admin-quick-link-manager-id">/plugins/${project.artifactId}/add-link.action?key=$generalUtil.urlEncode($helper.spaceKey)</link>
</web-item>

<xwork name="Example Actions" key="example-actions">
<description>Examples of actions</description>
<package name="space-links-xwork-package" extends="default" namespace="/plugins/${project.artifactId}">
<default-interceptor-ref name="validatingStack"/>

<action name="add-link" class="com.atlassian.examples.MyAction" method="doCreate">
<result name="input" type="velocity">/templates/add-link-action.vm</result>
<result name="success" type="velocity">/templates/add-link-action.vm</result>
</action>

<action name="mixed" class="com.atlassian.examples.MixedAction" method="doDefault">
<result name="input" type="velocity">/templates/mixed-space-screen.vm</result>
</action>
</package>
</xwork>

</atlassian-plugin>