Help with webhook and ThingSpeak

Need Help With My Project
18 
Exception in thread "main" java.lang.NullPointerException                                                                      
        at javax.mail.internet.InternetAddress.parse(InternetAddress.java:679)                                                 
        at javax.mail.internet.InternetAddress.parse(InternetAddress.java:638)                                                 
        at javax.mail.internet.InternetAddress.<init>(InternetAddress.java:111)                                                
        at cc.blynk.server.notifications.mail.SparkPostMailClient.<init>(SparkPostMailClient.java:39)                          
        at cc.blynk.server.notifications.mail.MailWrapper.<init>(MailWrapper.java:23)                                          
        at cc.blynk.server.Holder.<init>(Holder.java:85)                                                                       
        at cc.blynk.server.launcher.ServerLauncher.start(ServerLauncher.java:63)                                               
        at cc.blynk.server.launcher.ServerLauncher.main(ServerLauncher.java:59)