Got it working and found the cause. If you dont specify a FTP folder in stokerkontrol options then you get error in log:
com.enterprisedt.net.ftp.FTPException: 550 \: No such file or directory.
It is strange because it worked before I reinstalled my pc. So if I want to upload to the root folder of the ftp server, I cant.
Is it a bug? I am using stokerkontrol v3.12.