SQL oracle error, foreign key constraint issue

Question

I have multiple tables :

• Student(StudentID[pk], StudentName)

• Qualified(FID[pk], CourseID[pk], dateQ)

• Faculty(FID[pk], Fname)

• Course(CourseID[pk], CourseName)

And I need to create 2 more, which are Section, and Registration.

• Section(SectionNo[pk], Semester[pk], CourseID[pk])

• Registration(StudentID[pk], SectionNo[pk], Semester[pk])

I first create section without any issues:

create table section(
SectionNo number(28) not null,
Semester varchar(25) not null,
CourseID varchar(25) not null,
constraint sec_pk primary key(SectionNo,Semester,CourseID),
constraint sec_fk foreign key(CourseID) references Course(CourseID)
on delete cascade);

Then I try to make a table called registration, but it gives me the error in the title.

create table registration(
StudentID number(28) not null,
SectionNo number(28) not null,
Semester varchar(25) not null,
constraint reg_pk primary key(SectionNo,StudentID,Semester),
constraint reg_fk foreign key(StudentID) references Student(StudentID)
on delete cascade,
constraint reg_fk2 foreign key(SectionNo,Semester) references 
Section(SectionNo,Semester) on delete cascade);