This is possible because you are making mistake while filling the Registration number and Password Som eof the other possible mistakes we do while downloading the JEE Advanced Admit Card as follows  •                                 Typing wrong registration number•                                 Documents may not be uploaded correctly•                                 If do not Fill the DOB and Mobile, no. correctly•                                 The server is downIf you get problems, you can check out the given task one by one or contact to the JEE Office