codenameone - EOFException when reading file from storage (cn1) -

i have made externalizable object - user. works fine when writing , reading storage except if exit app , reopen it. error occurs:

java.io.eofexception @ java.io.datainputstream.readfully(datainputstream.java:197) @ java.io.datainputstream.readutf(datainputstream.java:609) @ java.io.datainputstream.readutf(datainputstream.java:564) @ com.codename1.io.util.readutf(util.java:962)

i have registered class follows in statemachine:

@override     protected void initvars(resources res) {         util.register("user", user.class); } 

this class:

package userclasses;  import com.codename1.io.externalizable; import com.codename1.io.util; import java.io.datainputstream; import java.io.dataoutputstream; import java.io.ioexception; import java.util.date;  /**  *  *   */ public class user implements externalizable {      private static final int version = 1;      public int userid;     public string username;     public string password;     public string firstname;     public string surname;     public string email;     public date registerdate;     public boolean paiduser;     public double runstep;     public double walkstep;        public user(){     }      @override     public int getversion() {         return version;      }      @override     public void externalize(dataoutputstream out) throws ioexception {         out.write(userid);         util.writeutf(username, out);         util.writeutf(password, out);         util.writeutf(firstname, out);         util.writeutf(surname, out);         util.writeutf(email, out);         out.writelong(registerdate.gettime());         out.writeboolean(paiduser);         out.writedouble(runstep);         out.writedouble(walkstep);      }      @override     public void internalize(int version, datainputstream in) throws      ioexception {         userid = in.readint();         username = util.readutf(in);         password = util.readutf(in);         firstname = util.readutf(in);         surname = util.readutf(in);         email = util.readutf(in);         registerdate = new date(in.readlong());         paiduser = in.readboolean();         runstep = in.readdouble();         walkstep = in.readdouble();      }      @override     public string getobjectid() {         return "user";     }     } 

replace:

out.write(userid); 

with:

out.writeint(userid); 

the default write method equivalent of writebyte.