Failure authenticating with BASIC 'Sling (Development)'

Issue: When we try to replicate anything from author to publisher I am getting below error. and not even on any replication it keep printing the log in error.log file automatically after an interval. What could be the cause of this? 

24.10.2019 11:31:05.942 *INFO* [oak-repository-executor-1] com.adobe.granite.repository Service [34344, [org.apache.jackrabbit.oak.api.jmx.SessionMBean]] ServiceEvent REGISTERED

24.10.2019 11:31:20.180 *INFO* [sling-default-2812-com.day.cq.replication.impl.ReverseReplicator.22529] org.apache.commons.httpclient.auth.AuthChallengeProcessor basic authentication scheme selected

24.10.2019 11:31:20.180 *INFO* [sling-default-2812-com.day.cq.replication.impl.ReverseReplicator.22529] org.apache.commons.httpclient.HttpMethodDirector Failure authenticating with BASIC 'Sling (Development)'@localhost:4503

24.10.2019 11:31:24.323 *INFO* [oak-repository-executor-1] com.adobe.granite.repository Service [34345, [org.apache.jackrabbit.oak.api.jmx.SessionMBean]] ServiceEvent REGISTERED

Resolution: This error message you are getting because, AEM author replication agent is unable to communicate with publisher instance due to bad credential (username and password). You might change the password of admin user in publisher and forget to update the password on default author agent. Once you will update the valid authentication credential in default author replication agent this error will be no more logged in the error.log file.

By default AEM system keep generating events and try to transport the same to publisher instance, every time it send the replication request to replication agent the authentication get failed thats why this log is get printed after a certain interval. 

Reference: 

https://helpx.adobe.com/in/experience-manager/6-3/sites/deploying/using/replication.html