SQL Management Error message

Question

hello everyone

I m designing a database before using it with VB.

I m at stage of building relationships

 

I m trying to build a relationship between table  Faculty and table Course.

 

Following is the  error  message SQL Management is displaying to me 

 

'faculty' table saved successfully

'Course' table

- Unable to create relationship 'FK_Course_faculty'.

The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "FK_Course_faculty". The conflict occurred in database "CSE_DEPT", table "dbo.faculty", column 'faculty_id'.

 

 

I tried to read it carefully i m unable to understand what is wrong in the faculty table.  Please help

my database has 5 tables ( Course,Faculty,Login, Student,StudentCourse)

i have already build the following relationship between tables Login/ Faculty and between Login/Student tables 

 

please help