Error of email sending, flexiblelogin

[18:06:49] [pool-3-thread-13/ERROR] [flexiblelogin]: Transport provider not found
flexiblelogin.javax.mail.NoSuchProviderException: No provider for stmps
        at flexiblelogin.javax.mail.Session.getProvider(Session.java:514) ~[Session.class:?]
        at flexiblelogin.javax.mail.Session.getTransport(Session.java:712) ~[Session.class:?]
        at flexiblelogin.javax.mail.Session.getTransport(Session.java:693) ~[Session.class:?]
        at flexiblelogin.javax.mail.Session.getTransport(Session.java:673) ~[Session.class:?]
        at com.github.games647.flexiblelogin.tasks.SendMailTask.run(SendMailTask.java:59) ~[SendMailTask.class:?]
        at org.spongepowered.api.scheduler.Task$Builder.lambda$execute$0(Task.java:139) ~[Task$Builder.class:1.12.2-2555-7.1.0-BETA-2817]
        at org.spongepowered.common.scheduler.SchedulerBase.lambda$startTask$0(SchedulerBase.java:186) ~[SchedulerBase.class:1.12.2-2555-7.1.0-BETA-2817]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_151]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_151]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_151]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_151]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_151]
[18:06:49] [pool-3-thread-13/ERROR] [flexiblelogin]: Registered providers: [flexiblelogin.javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Oracle], flexiblelogin.javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle], flexiblelogin.javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle], flexiblelogin.javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Oracle], flexiblelogin.javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Oracle], flexiblelogin.javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Oracle]]