mysql - error #1452 - assign FK twice for the same PK -

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I get this error - # 1452 - Child row can not be added or updated: a foreign key obstacle fails She goes.

Do I think I try to hand over multiple foreign keys to a primary key, or is not it?

My table looks like this 

  User ===== UID (PK) Friend ====== UID (F.K.) User Order ID = ===== Oder ID UID (F.K. of UserUID) & lt; - It is not certain whether this is possible or not    
 
 
 You may order And trying to enter the FP user ID value to the friend, which is not present in the user table.

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