Noclassdeffound Error On Ftp Client: Org.apache.commons.net.ftp.ftpclient

I am working on an app that sends files to a url database. I am starting with just trying to send a picture. Currently I am getting a noclassDefFound error in my java. I have tried

Solution 1:

Add commons-net-3.1.jar File in the libs folder of your Application. click here

Solution 2:

If this error because of jar files this solution will solve your problem. look at this ClassDefNotFound error in android