Hello everyone, does anyone know how to solve this problem? thank you！ Buildfile: D:\UserData\z004uzez\Documents\Mendix\deployment\build_core.xml compile: [javac] Compiling 378 source files to D:\UserData\z004uzez\Documents\Mendix\deployment\run\bin [javac] D:\UserData\z004uzez\Documents\Mendix\javasource\emailnew\actions\SendEmail.java:16: error: package email.proxies does not exist [javac] import email.proxies.EmailLog; [javac] ^ [javac] D:\UserData\z004uzez\Documents\Mendix\javasource\emailnew\actions\SendEmail.java:17: error: package email.proxies does not exist [javac] import email.proxies.FileDocument; [javac] ^ [javac] D:\UserData\z004uzez\Documents\Mendix\javasource\emailnew\actions\SendEmail.java:18: error: package email.proxies does not exist [javac] import email.proxies.MailQueue; [javac] ^ [javac] D:\UserData\z004uzez\Documents\Mendix\javasource\emailmodule\actions\SendEmailAction.java:34: error: method sendEmail in class EmailUtil cannot be applied to given types; [javac] boolean ret = EmailUtil.sendEmail(this.EmailSendLog.getEmailSendLog_EmailAccount().getAccount(), [javac] ^ [javac] required: String,String,String,String,String,String,String,String,String [javac] found: String,String,String,String,String,String,String [javac] reason: actual and formal argument lists differ in length [javac] D:\UserData\z004uzez\Documents\Mendix\javasource\emailnew\actions\SendEmail.java:89: error: cannot find symbol [javac] for (MailQueue mailQueue : mailList) { [javac] ^ [javac] symbol: class MailQueue [javac] location: class SendEmail [javac] D:\UserData\z004uzez\Documents\Mendix\javasource\emailnew\actions\SendEmail.java:99: error: package email.proxies does not exist [javac] List<email.proxies.FileDocument> fileDocument = mailQueue.getMailQueue_FileDocument(); [javac] ^ [javac] D:\UserData\z004uzez\Documents\Mendix\javasource\emailnew\actions\SendEmail.java:101: error: cannot find symbol [javac] for (FileDocument File : fileDocument) { [javac] ^ [javac] symbol: class FileDocument [javac] location: class SendEmail [javac] D:\UserData\z004uzez\Documents\Mendix\javasource\emailnew\actions\SendEmail.java:124: error: package email.proxies does not exist [javac] email.proxies.EmailLog log = new EmailLog(getContext()); [javac] ^ [javac] D:\UserData\z004uzez\Documents\Mendix\javasource\emailnew\actions\SendEmail.java:124: error: cannot find symbol [javac] email.proxies.EmailLog log = new EmailLog(getContext()); [javac] ^ [javac] symbol: class EmailLog [javac] location: class SendEmail [javac] D:\UserData\z004uzez\Documents\Mendix\javasource\emailnew\actions\SendEmail.java:138: error: package email.proxies does not exist [javac] email.proxies.EmailLog log = new EmailLog(getContext()); [javac] ^ [javac] D:\UserData\z004uzez\Documents\Mendix\javasource\emailnew\actions\SendEmail.java:138: error: cannot find symbol [javac] email.proxies.EmailLog log = new EmailLog(getContext()); [javac] ^ [javac] symbol: class EmailLog [javac] location: class SendEmail [javac] D:\UserData\z004uzez\Documents\Mendix\javasource\emailnew\actions\SendEmail.java:151: error: package email.proxies does not exist [javac] email.proxies.MailQueue mq = new MailQueue(getContext()); [javac] ^ [javac] D:\UserData\z004uzez\Documents\Mendix\javasource\emailnew\actions\SendEmail.java:151: error: cannot find symbol [javac] email.proxies.MailQueue mq = new MailQueue(getContext()); [javac] ^ [javac] symbol: class MailQueue [javac] location: class SendEmail [javac] D:\UserData\z004uzez\Documents\Mendix\javasource\myfirstmodule\actions\SendEmailAction.java:34: error: method sendEmail in class EmailUtil cannot be applied to given types; [javac] boolean ret = EmailUtil.sendEmail(this.EmailSendLog.getEmailSendLog_EmailAccount().getAccount(), [javac] ^ [javac] required: String,String,String,String,String,String,String,String,String [javac] found: String,String,String,String,String,String,String [javac] reason: actual and formal argument lists differ in length [javac] Note: Some input files use or override a deprecated API. [javac] Note: Recompile with -Xlint:deprecation for details. [javac] 14 errors BUILD FAILEDD:\UserData\z004uzez\Documents\Mendix\deployment\build_core.xml:30: Compile failed; see the compiler error output for details.