The following error occurs at post-processing my freestyle build. Please advice.

Email was triggered for: Always
Sending email for trigger: Always
groovy.lang.MissingMethodException: No signature of method: jakarta.mail.internet.MimeMessage.getRecipients() is applicable for argument types: (javax.mail.Message$RecipientType) values: [To]
Possible solutions: getRecipients(jakarta.mail.Message$RecipientType), getRecipients(jakarta.mail.Message$RecipientType), setRecipients(jakarta.mail.Message$RecipientType, [Ljakarta.mail.Address, setRecipients(jakarta.mail.Message$RecipientType, [Ljakarta.mail.Address, setRecipients(jakarta.mail.Message$RecipientType, java.lang.String), getAllRecipients()
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:71)
at org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:48)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:128)
at Script1.run(Script1.groovy:1)
at hudson.plugins.emailext.ExtendedEmailPublisher.executeScript(ExtendedEmailPublisher.java:728)
at hudson.plugins.emailext.ExtendedEmailPublisher.executePresendScript(ExtendedEmailPublisher.java:677)
at hudson.plugins.emailext.ExtendedEmailPublisher.sendMail(ExtendedEmailPublisher.java:527)
at hudson.plugins.emailext.ExtendedEmailPublisher._perform(ExtendedEmailPublisher.java:484)
at hudson.plugins.emailext.ExtendedEmailPublisher.perform(ExtendedEmailPublisher.java:385)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:818)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:767)
at hudson.model.Build$BuildExecution.cleanUp(Build.java:189)
at hudson.model.Run.execute(Run.java:1947)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:44)
at hudson.model.ResourceController.execute(ResourceController.java:101)
at hudson.model.Executor.run(Executor.java:442)