Java Question java.lang.NoClassDefFoundError !? :-/

package thalmy.smbuddy;

import java.util.LinkedList;
import jcifs.UniAddress;
import jcifs.smb.*;
import anywheresoftware.b4a.BA.Author;
import anywheresoftware.b4a.BA.DependsOn;
import anywheresoftware.b4a.BA.Permissions;
import anywheresoftware.b4a.BA.ShortName;
import anywheresoftware.b4a.BA.Version;
import anywheresoftware.b4a.keywords.Common;


@ShortName("SMBuddy") 
@Permissions(values={"android.permission.INTERNET"})
@Author("René Thalmann")
@Version((float) 1.00) 
@DependsOn(values={"jcfis"})



public class smbuddy {
   
   private UniAddress domain;
   private NtlmPasswordAuthentication authentication;
   
   public smbuddy()
   {
       //    
   }
   
    /**
     * @param address
     * @param username
     * @param password
     * @throws java.lang.Exception
     */
    public void login(String address, String username, String password) throws Exception
    {
       try {
          setDomain(UniAddress.getByName(address));
          setAuthentication(new NtlmPasswordAuthentication(address, username, password));
          SmbSession.logon(getDomain(), authentication);
       }
       catch (Exception e) {
            Common.Log("Failed Login: + e");
            //System.exit(1); 
           //NOTE exception or error here will close Android-application 
        }
       
    }
     
    /**
    *
    * @param path
    * @return linkedlist
    * @throws java.lang.Exception
    */
   public LinkedList<String> getList(String path) throws Exception
   {
       LinkedList<String> fList = new LinkedList<String>();
       //SmbFile f = new SmbFile(path,authentication);
       try {
       SmbFile f = new SmbFile(path);
       SmbFile[] fArr = f.listFiles();
       
          for(int a = 0; a < fArr.length; a++)
          {
              fList.add(fArr[a].getName());
              Common.Log(fArr[a].getName());
          }
       }
       
       catch (Exception e) {
           Common.Log("getList: + e");
           //System.exit(1); 
          //NOTE exception or error here will close Android-application 
       }
       

       return fList;
   }

   /**
    *
    * @param path
    * @return boolean
    * @throws java.lang.Exception
    */
   public boolean checkDirectory(String path) throws Exception
   {
       if(!isExist(path))
       {
           Common.Log(path + " not exist");
           return false;
       }

       if(!isDir(path))
       {
          Common.Log(path + " not a directory");
           return false;
       }

       return true;
   }

   /**
    *
    * @param path
    * @return boolean
    * @throws java.lang.Exception
    */
   public boolean isExist(String path) throws Exception
   {
       SmbFile sFile = new SmbFile(path, authentication);

       return sFile.exists();
   }

   /**
    *
    * @param path
    * @return boolean
    * @throws java.lang.Exception
    */
   public boolean isDir(String path) throws Exception
   {
       SmbFile sFile = new SmbFile(path, authentication);

       return sFile.isDirectory();
   }

   /**
    *
    * @param path
    * @throws java.lang.Exception
    */
   public void createDir(String path) throws Exception
   {
      SmbFile sFile = new SmbFile(path, authentication);

      sFile.mkdir();
   }

   /**
    *
    * @param path
    * @throws java.lang.Exception
    */
   public void delete(String path) throws Exception
   {
       SmbFile sFile = new SmbFile(path, authentication);
       sFile.delete();
   }

   /**
    *
    * @param path
    * @return long
    * @throws java.lang.Exception
    */
   public long size(String path) throws Exception
   {
       SmbFile sFile = new SmbFile(path, authentication);

       return sFile.length();
   }

   /**
    *
    * @param path
    * @return string
    * @throws java.lang.Exception
    */
   public String getFileName(String path) throws Exception
   {
       SmbFile sFile = new SmbFile(path, authentication);

       return sFile.getName();
   }

   /**
    * @return the domain
    */
   public UniAddress getDomain()
   {
       return domain;
   }

   /**
    * @param domain the domain to set
    */
   
   public void setDomain(UniAddress domain)
   {
       this.domain = domain;
   }
   

   /**
    * @return the authentication
    */
   public NtlmPasswordAuthentication getAuthentication()
   {
       return authentication;
   }

   /**
    * @param authentication the authentication to set
    */
   public void setAuthentication(NtlmPasswordAuthentication authentication)
   {
       this.authentication = authentication;
   }

}