External string does not exist error while trying to deploy through Jenkins - deployment

Question

We have repo with salesforce code. Goal is to deploy it to scratch org and launch tests.
Below is the error as we are getting while running a Jenkins pipeline for common libraries.
Error src/main/java/com/spartasystems/twd/security/PermissionGuard.cls External string does
not exist: PERMISSION_DENIED_AN_OBJECT (27:82)
Error src/main/java/com/spartasystems/twd/security/PermissionGuard.cls External string does
not exist: PERMISSION_DENIED_A_FIELD (29:82)
ERROR running force:source:deploy: Deploy failed.
My deploy code looks like as shows below:
stage('MDAPI Deploy To Scratch Org'){
sh 'ls -al'
sh 'cat sfdx-project.json'
sh 'cat src/labels/*'
SFDX.deployMDAPISourceCodeToScratchOrg("./abc/src/");
SFDX.deployMDAPISourceCodeToScratchOrg("./xyz/src/");
sh 'rm src/main/java/com/company/twd/util/DebuggingUtil'
sh 'sfdx force:source:deploy -x src/main/resources/package.xml'
}
Here is the package.xml file
<?xml version="1.0" encoding="UTF-8"?>
<Package xmlns="http://soap.sforce.com/2006/04/metadata">
<types>
<members>*</members>
<name>ApexClass</name>
</types>
<types>
<members>*</members>
<name>CustomObject</name>
</types>
<types>
<members>*</members>
<name>CustomLabels</name>
</types>
<version>49.0</version>
</Package>
Can anyone help me here as I am stuck and unable to fix this issue ?
I have got a response from Salesforce Stack Exchange that this might be something related to third-party java library . I am unable to understand whether there is an issue with Labels missing in Salesforce org or what else.
Kindly help me with this.

Answer 1

If you are using custom label then 'Custom label' must already exist in targeting environment(where you are deploying the code through Jenkins).

Answer 2

I don't think you understand my question from comments.
If the apex class PermissionGuard contains references like Label.PERMISSION_DENIED_AN_OBJECT then:
that "custom label" must already exist in the target environment
or your deployment must be creating that custom label in the same action that creates/updates this class.
It's not a Jenkins problem. You're pulling the files from some Git repo or locally on filesystem? If the developer committed to Git only the class but not the custom labels file - shout at the dev that this is not deployable. Whether to scratch org, to sandbox or to production.
The labels\CustomLabels.labels file will look similar to this
<?xml version="1.0" encoding="UTF-8"?>
<CustomLabels xmlns="http://soap.sforce.com/2006/04/metadata">
<labels>
<fullName>CommunityAccessSuspended</fullName>
<categories>Community, Login</categories>
<language>en_US</language>
<protected>false</protected>
<shortDescription>CommunityAccessSuspended</shortDescription>
<value>Your access is disabled. Please contact your site administrator.</value>
</labels>
</CustomLabels>
If the dev doesn't know how to download the fresh file from org, sfdx force:mdapi:retrieve -r ./mdapi -u yourUsername#yourCompany.com -k ./path/to/package.xml should be a good start.