issues with logback using springboot - spring-boot

Question

please help me...I'm new to programming so please dumb it down for me.
I'm building a project and below is my code. however, I keep getting an error message that's included below.
Now I saw a previous thread that says I should use an earlier version of logback, but I dont now how to change it to the previous version. Can someone please walk me through it. I would really appreciate an fix to my problem so that I can move forward.
Thanks
Error message:
Logging system failed to initialize using configuration from 'null' java.lang.IllegalStateException: Logback configuration error detected: ERROR in ch.qos.logback.core.joran.action.AppenderRefAction - Could not find an appender named [appender_name_IS_UNDEFINED]. Did you define it below instead of above in the configuration file? ERROR in ch.qos.logback.core.joran.action.AppenderRefAction - See http://logback.qos.ch/codes.html#appender_order for more details.
My CODE:
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<include resource="org/springframework/boot/logging/logback/defaults.xml" />
<springProperty scope="context" name="appender_name" source="app.logging-to" />
<appender name="console" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%clr(%d{yyyy-MM-dd HH:mm:ss.SSS}){faint} %clr(%5p) [PID: %clr(${PID:- }){magenta}] %clr(-){faint} %clr([%15.15t]){faint} %clr(%-40.40logger{39}){cyan} %clr(:){faint} %m%n%wEx
</pattern>
<charset>utf8</charset>
</encoder>
</appender>
<appender name="file" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>Cloud-Panel-Logs.log</file>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>Cloud-Panel-Logs.%d{yyyy-MM}.log</fileNamePattern>
<maxHistory>6</maxHistory>
<totalSizeCap>1GB</totalSizeCap>
</rollingPolicy>
<encoder>
<pattern>%clr(%d{yyyy-MM-dd HH:mm:ss.SSS}){faint} %clr(%5p) [PID: %clr(${PID:- }){magenta}] %clr(-){faint} %clr([%15.15t]){faint} %clr(%-40.40logger{39}){cyan} %clr(:){faint} %m%n%wEx
</pattern>
<charset>utf8</charset>
</encoder>
</appender>
<appender name="ASYNC_CONSOLE" class="ch.qos.logback.classic.AsyncAppender">
<appender-ref ref="${appender_name}" />
<discardingThreshold>0</discardingThreshold>
<queueSize>100000</queueSize>
<includeCallerData>false</includeCallerData>
<neverBlock>false</neverBlock>
</appender>
<root level="INFO">
<appender-ref ref="ASYNC_CONSOLE" />
</root>
</configuration>
I've tried installing every other extension for spring and problems still exist...