ARTIFACTORY: How to resolve the error "Invalid content was found starting with element"

This error “Invalid content was found starting with element” during the Artifactory startup usually means there is a mandatory parameter that is missing or there is an invalid parameter in artifactory.config.latest.xml file.

For example, the below error denotes cronExp parameter is missing in artifactory.config.latest.xml
Caused by: org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element '{"http://artifactory.jfrog.org/xsd/3.1.2":retentionPeriodHours} '. One of '{"http://artifactory.jfrog.org/xsd/3.1.2":dir , "http://artifactory.jfrog.org/xsd/3.1.2":cronExp} ' is expected.

Looking at artifactory.config.latest.xml file we can observe the cronExp tag is missing for one of the configuration fields. In the below case cronExp missing on the backup config: 

Before the change:

<backup>
<key>backup-weekly</key>
<enabled>false</enabled>
<retentionPeriodHours>168</retentionPeriodHours>
<createArchive>false</createArchive>
<excludedRepositories/>
<sendMailOnError>true</sendMailOnError>
<excludeNewRepositories>false</excludeNewRepositories>
<precalculate>false</precalculate>
</backup>

Further, adding the parameter as shown below, renaming the
artifactory.config.latest.xml
to
artifactory.config.import.xml
and restarted Artifactory application to reflect the changes.
 

After the change:

<backup>
<key>backup-weekly</key>
<enabled>false</enabled>
<cronExp>0 0 2 ? * SAT</cronExp>
<retentionPeriodHours>168</retentionPeriodHours>
<createArchive>false</createArchive>
<excludedRepositories/>
<sendMailOnError>true</sendMailOnError>
<excludeNewRepositories>false</excludeNewRepositories>
<precalculate>false</precalculate>
</backup>