Parcelable Android

I need to do the Parcelable of this class, but it is giving the error:

  

class not found when unmarshalling

Could you help me?

My class:

    public class Internship implements Parcelable {
        private Enterprise enterprise;
        private int id;
        private String publicationTime;
        private String startDate;
        private String end_date;
        private String requirements;
        private String benefits;
        private int semester;
        private String title;
        private String observation;
        private ArrayList<Course> courses = new ArrayList<Course>();

        public Internship(){

        }

        public Internship(Parcel in){
           this.enterprise = in.readParcelable(Enterprise.class.getClassLoader());
           this.id = in.readInt();
           this.publicationTime = in.readString();
           this.startDate = in.readString();
           this.end_date = in.readString();
           this.requirements = in.readString();
           this.benefits = in.readString();
           this.semester = in.readInt();
           this.title = in.readString();
           this.observation = in.readString();
           in.readList(courses, Course.class.getClassLoader()); 
       }

       public ArrayList<Course> getCourses() {
           return courses;
       }

       public void addCourseToCourses(Course course) {
           this.courses.add(course);
       }

       public Enterprise getEnterprise() {
           return enterprise;
       }

       public void setEnterprise(Enterprise enterprise) {
           this.enterprise = enterprise;
       }

       public int getId() {
           return id;
       }

       public void setId(int id) {
           this.id = id;
       }

       public String getPublicationTime() {
           return publicationTime;
       }

       public void setPublicationTime(String publication_time) {
           this.publicationTime = publication_time;
       }

       public String getStartDate() {
           return startDate;
       }

       public void setStartDate(String start_date) {
           this.startDate = start_date;
       }

       public String getEnd_date() {
           return end_date;
       }

       public void setEnd_date(String end_date) {
           this.end_date = end_date;
       }

       public String getRequirements() {
           return requirements;
       }

       public void setRequirements(String requirements) {
           this.requirements = requirements;
       }

       public String getBenefits() {
           return benefits;
       }

       public void setBenefits(String benefits) {
           this.benefits = benefits;
       }

       public int getSemester() {
           return semester;
       }

       public void setSemester(int semester) {
           this.semester = semester;
       }

       public String getTitle() {
           return title;
       }

       public void setTitle(String title) {
           this.title = title;
       }

       public String getObservation() {
           return observation;
       }

       public void setObservation(String observation) {
           this.observation = observation;
       }

       public static final Parcelable.Creator<Internship> CREATOR = new Parcelable.Creator<Internship>() {
            public Internship createFromParcel(Parcel in){
            return new Internship(in);
       }

       public Internship[] newArray(int size){
            return new Internship[size];
       }
    };

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(id);
        dest.writeString(publicationTime);
        dest.writeString(title);
        dest.writeString(startDate);
        dest.writeString(end_date);
        dest.writeString(requirements);
        dest.writeString(benefits);
        dest.writeInt(semester);
        dest.writeString(observation);
        dest.writeList(courses);
     }
 }