Jenkins Notification error

Jenkins setup:2.252
getting error unable to send mail notification

def COMMIT_HASH
def WORKSPACE_PATH
def COPYLIBRARY_BAT_PATH
node {
this.WORKSPACE_PATH = “C:/Jenkins/workspace/{env.JOB_NAME}" stage('Checkout') { try { sshPublisher( continueOnError: false, failOnError: true, publishers: [ sshPublisherDesc( configName: '10_224_14_87_test', verbose: true, transfers: [ sshTransfer( execCommand: 'sc start metricbeat' ) ], ) ] ) currentBuild.result = "SUCCESS" } } catch(e) { currentBuild.result = "FAILED" this.notifyBuild("Checkout: {e}”)
throw e
}
finally
{
// Success or failure, always send notifications
this.notifyBuild(currentBuild.result)
}
}

}

def notifyBuild(String buildStatus = ‘STARTED’) {
// build status of null means successful
buildStatus = buildStatus ?: ‘SUCCESS’

def requestBody = """
    {
        "to": "tharunk.kumar@nuvama.com",
        "subject": "Test ${buildStatus}: Job ${env.JOB_NAME} [${env.BUILD_NUMBER}]",
        "body": "<p>STARTED: Job ${env.JOB_NAME} [${env.BUILD_NUMBER}]:</p> Deploy Branch: ${branch} <p>Check console output at <a href='${env.BUILD_URL}'>${env.JOB_NAME} [${env.BUILD_NUMBER}]</a> </p>"
    }
"""

httpRequest consoleLogResponseBody: true, contentType: 'APPLICATION_JSON', httpMode: 'POST', httpProxy: 'zia.edelcap.com:80', requestBody: requestBody, responseHandle: 'NONE', timeout: 10000, url: 'https://prod2-29.centralindia.logic.azure.com:443/workflows/9c9e801553cc4884840af45cb943cd18/triggers/manual/paths/invoke?api-version=2016-06-01&sp=%2Ftriggers%2Fmanual%2Frun&sv=1.0&sig=v1H0Q0_i5mFa4MvI6GAbos2dmNcB3Al72yLfdKDaQsU', useSystemProperties: true, wrapAsMultipart: false

}

Error:
groovy.lang.MissingPropertyException: No such property: branch for class: groovy.lang.Binding
at groovy.lang.Binding.getVariable(Binding.java:63)
at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onGetProperty(SandboxInterceptor.java:270)
at org.kohsuke.groovy.sandbox.impl.Checker$7.call(Checker.java:353)
at org.kohsuke.groovy.sandbox.impl.Checker.checkedGetProperty(Checker.java:357)
at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.getProperty(SandboxInvoker.java:29)
at com.cloudbees.groovy.cps.impl.PropertyAccessBlock.rawGet(PropertyAccessBlock.java:20)
at WorkflowScript.notifyBuild(WorkflowScript:50)
at WorkflowScript.run(WorkflowScript:31)
at cps.transform(Native Method)
at com.cloudbees.groovy.cps.impl.PropertyishBlock$ContinuationImpl.get(PropertyishBlock.java:74)
at com.cloudbees.groovy.cps.LValueBlock$GetAdapter.receive(LValueBlock.java:30)
at com.cloudbees.groovy.cps.impl.PropertyishBlock$ContinuationImpl.fixName(PropertyishBlock.java:66)
at sun.reflect.GeneratedMethodAccessor431.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
at com.cloudbees.groovy.cps.impl.ConstantBlock.eval(ConstantBlock.java:21)
at com.cloudbees.groovy.cps.Next.step(Next.java:83)
at com.cloudbees.groovy.cps.Continuable$1.call(Continuable.java:174)
at com.cloudbees.groovy.cps.Continuable$1.call(Continuable.java:163)
at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:129)
at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:268)
at com.cloudbees.groovy.cps.Continuable.run0(Continuable.java:163)
at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.access$001(SandboxContinuable.java:18)
at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.run0(SandboxContinuable.java:51)
at org.jenkinsci.plugins.workflow.cps.CpsThread.runNextChunk(CpsThread.java:185)
at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:400)
at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$400(CpsThreadGroup.java:96)
at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:312)
at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:276)
at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java:67)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:136)
at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:59)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Finished: FAILURE

Hello @tharun456,

Is your branch variable defined in your Groovy script?